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VOA科学技术2024--Researchers Discover World's Oldest Tadpole

时间：2025-01-09 02:07:46

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（单词翻译）

Scientists in Argentina have discovered the oldest-known remains of the tadpole. The animal belonged to a large frog species that lived alongside dinosaurs about 161 million years ago.

The researchers said the 16-centimeter-long tadpole died during the larval period, or stage, of frog development. The discovery is providing new information about the development of frogs and toads.

The remains suggest tadpoles today are largely unchanged from their ancestors in the ancient time called the Jurassic period. The oldest-known frog remains date back even further, though no older tadpole fossils have been found.

The remains are in good condition. In fact, researchers say, the ancient tadpole has some soft tissues rarely seen in fossils. The tadpole's eyes and nerves, for example, appear as dark markings in the fossil.

Fossil hunters found the tadpole in 2020, during a dig for dinosaur remains on a ranch in the southern province of Santa Cruz. The fossil includes the tadpole's head and most of its body.

Frogs have a two-stage life cycle, with the tadpole larva developing into the adult form. This tadpole was in the late stages of development. Adults of this species are a similar length as the tadpole, the researchers said.

"It's not only the oldest tadpole in the world and amazingly preserved, but it also tells us about the size of one of the few frog species known from that time," said biologist Mariana Chuliver of Fundación Azara-Universidad Maimónides.

Chuliver was the lead writer of the study that appeared recently in the scientific publication Nature.

Chuliver said the soft tissue remains are important because they permit researchers to "know the diet and lifestyle of these organisms."

The remains, Chuliver added, show that the form and structure of tadpoles have "remained almost unchanged over the last 160 million years."

I'm John Russell.

Miguel Lo Bianco reported on this story for Reuters. John Russell adapted it for VOA Learning English.

_______________________________________________

Words in This Story

species - n. a class of animals having common attributes and designated by a common name

fossil - n. the remains of an organism of past geologic ages that has been preserved in the earth's crust

preserve - v. to keep intact or free from decay


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0 adapted fcb84bd21a9a5f8a70e419f49bf22fb3     
adj.适合的v.（使）适应， （使）适合( adapt的过去式和过去分词 )；改编，改写；改变…以适合(for)；适应于，适应不同情况（或环境）(to)
参考例句：
  • Most of these tools have been specially adapted for use by disabled people. 这些工具多数已经过特别改装，供残疾人使用。
  • The engine is being specially adapted to increase its power. 正在对这台引擎进行改装以增加它的功率。
0 added mzJzm0     
adj.更多的，附加的，额外的
参考例句：
  • They have added a new scene at the beginning.在开头他们又增加了一场戏。
  • The pop music added to our enjoyment of the film.片中的流行音乐使我们对这部电影更加喜爱。
0 adult 7xTzv     
adj.成年的，成熟的；n.成年人
参考例句：
  • Children and adult should have equal rights.儿童和成年人应该享有平等的权利。
  • He'd spent all his adult life in the army.他的成年生活全是在军队里度过的。
0 adults 0e18c75349f370277c4f7d767609163c     
n.成年的人或动物( adult的名词复数 )
参考例句：
  • Adults are often immune to German measles. 成人往往对风疹有免疫力。
  • Many Chinese adults dress their children in brilliant orange, red and pink. 很多中国的成人给他们的孩子穿鲜艳的橘黄色、红色和粉色的衣服。 来自《简明英汉词典》
0 ago LKGyH     
adv./adj.以前（的），以往（的）
参考例句：
  • Where were you two years ago?两年前你在哪里？
  • Sheila was here a moment ago.不久以前希拉还在这里。
0 almost 7Llyo     
adv.几乎，差不多
参考例句：
  • The band has been on the road for almost a month. 那支乐队进行巡回演出近一个月了。
  • We stay in almost every night and watch television.我们几乎每个晚上都在家里看电视。
0 alongside XLWym     
adv.在旁边；prep.和...在一起，在...旁边
参考例句：
  • There was a butcher's shop alongside the theatre.剧院旁边有一家肉店。
  • Alongside of him stood his uncle.他的身旁站着他叔叔。
0 also 5LHyk     
adv.也，亦；并且；同样；而且，还
参考例句：
  • I also like chocolate ice cream.我也喜欢吃巧克力冰淇淋。
  • People also like to have a Christmas tree in the living-room.人们同样喜欢在起居室内摆一棵圣诞树。
0 amazingly amazingly     
adv.令人惊奇地
参考例句：
  • He smiled suddenly, exposing a set of amazingly white teeth. 他突然一笑，露出一口雪白的牙齿。
  • He'll get over it—young people are amazingly resilient. 他会克服这些的—年轻人的适应力惊人。
0 ancestors d33f9504baca2d4e88a291cff6f085f0     
n.祖先( ancestor的名词复数 )；祖宗；原型；（动物的）原种
参考例句：
  • His ancestors had come to America from Ireland. 他的祖先从爱尔兰来到美国。
  • The custom of worshipping ancestors is prevalent among these people. 崇拜祖先的风俗在这些人中是普遍的。 来自《简明英汉词典》
0 ancient 8LzyY     
adj.古代的，古老的；n.古人
参考例句：
  • This is an ancient story.这是一个古老的故事。
  • Xian is an ancient city.西安是一座古城。
0 animal HMPyw     
n.动物，兽，畜生
参考例句：
  • Whale is the biggest animal.鲸是最大的动物。
  • The cat is an animal.猫是一种动物。
0 animals animals     
n.动物( animal的名词复数 )；兽；兽性；粗野残暴的人
参考例句：
  • The time has come for action if these beautiful animals are to survive. 若要使这些美丽的动物能生存下去，现在就要行动起来。
  • All horses are animals, but not all animals are horses. 所有的马都是动物，但并不是所有的动物都是马。
0 appear fvnzw     
vi.出现，出场，出席，露面；似乎，好像，显得
参考例句：
  • The students appear very nervous.学生们看起来很紧张。
  • When night falls,stars appear.夜晚来到时星星出现。
0 appeared appeared     
v.出现( appear的过去式和过去分词 )；出庭（作证或受审）；演出；发表
参考例句：
  • Her beauty appeared ageless. 她的美显得经久不衰。
  • He appeared at breakfast bleary-eyed and with a hangover. 他吃早餐时两眼迷糊，宿醉未醒。
0 as pNiyL     
conj.按照；如同
参考例句：
  • He got work in a hotel as a waiter.他在一家旅馆找到了当服务生的工作。
  • In the hotel,the old men were drinking away as usual.在旅馆里，这些老人和往常一样喝个不停。
0 attributes 736b91750e516139acc13c5eb6564f92     
属性，特性，特质； 属性( attribute的名词复数 )； （人或物的）特征； 价值； [语法学]定语
参考例句：
  • She attributes her success to hard work and a little luck. 她认为她的成功来自勤劳和一点运气。
  • Any incomes policy must embody the attributes of fairness and flexibility. 任何收入政策都应该具有公平与灵活性之特征。
0 because EQXyl     
conj.由于，因为
参考例句：
  • Because his car is old.因为他的汽车旧了。
  • He was late because of an accident.他是因事故而迟到的。
0 belonged d2ea5ba23ccfca9f79b34bcd2b130d74     
v.属于( belong的过去式和过去分词 )；是…的成员；应被放在；适应
参考例句：
  • Politically, they belonged to the conservative party and opposed reform. 在政治上，他们是保守派，反对改革。 来自《简明英汉词典》
  • They belonged to a younger genration. 他们属于年轻的一代。 来自《现代英汉综合大词典》
0 biologist 4Rtyv     
n.生物学家
参考例句：
  • The biologist advanced a new theory of life.这位生物学家提出了一个有关生命的新学说。
  • This is that biologist having rescued her life.这就是救了她生命的那个生物学家。
0 body mRhy2     
n.身体，躯体；车身，船身；正文，主要部分
参考例句：
  • The young man has a strong body.这个年轻人有一副强壮的身体。
  • We'd better take good care of ourselves to have a healthy body.我们还是照顾好自己，保持身体健康的好。
0 called 4f33252742282f871b0617168156fd55     
v.叫( call的过去式和过去分词 )；通电话；认为；估计
参考例句：
  • She sensed something was amiss and called the police. 她觉得有点不对头，就叫了警察。
  • I called several times, but only got the answering machine. 我打了几次电话，但只有电话答录机答话。
0 common XX7yr     
adj.共同的，平常的，普通的；n.平民，普通，公地，公园
参考例句：
  • Man and the monkey have many things in common.人和猿有许多共同之处。
  • Britain and America share a common language.英国和美国共用一种语言。
0 condition qYYyn     
n.条件，状况，情况，地位；v.调节，制约，以…为条件
参考例句：
  • The house is in a good condition.房子条件良好。
  • His condition has more or less improved.他的情况多少有些改善。
0 crust enxzu     
n.(一片)面包皮，硬外皮，外壳；地壳
参考例句：
  • This article focuses on radiation present in the earth crust.本文重点介绍源自地壳的辐射。
  • Earth quakes can result from stresses in the earth's crust.地壳内的应力可能引起地震。
0 cycle ZyNx8     
n.周期，循环，自行车；vi.循环，轮转，骑自行车；vt.使循环
参考例句：
  • The seasons of the year make a cycle.一年四季构成一个循环。
  • Do you cycle to work everyday?你每天骑自行车上班吗？
0 dark gOQzT     
adj.黑色的；暗的；黑暗的
参考例句：
  • The night is too dark for us to see.夜间太暗，我们看不见。
  • The sky was dark blue and clear when the moon came up.月亮出来时，天空是深蓝色的，非常晴朗。
0 date OycxK     
n.日期；枣
参考例句：
  • Don't forget to date your letters.别忘了信上写明日期。
  • We'll change the date to March 28th.我们将把日期改到3月28日。
0 designated 2e3e4c6056e668bc95b729252f27e889     
a.指定的，特指的
参考例句：
  • Smoking is allowed in designated areas.允许在指定区域内吸烟。
0 developing futzl4     
adj.发展中的
参考例句：
  • Transport has always been the key to developing trade.运输一直是发展贸易的关键。
  • They are developing marketing network.他们正在发展销售网络。
0 development 6v6x8     
n.发育，成长；发展，进展；发达；开发
参考例句：
  • We shall follow closely the development of the situation.我们将密切注意形势的发展。
  • This is the late development of science.这是科学的新发展。
0 died 58e059bce7f67d5fa2bd7c3d5097a174     
vbl.死亡，消逝v.死亡，枯萎( die的过去式和过去分词 )；死时处于（某种状态）或具有（某种身份）adj.死亡的，消逝的
参考例句：
  • He was banished to Australia, where he died five years later. 他被流放到澳大利亚，五年后在那里去世。
  • He was utterly bereft when his wife died. 他的妻子去世时，他十分凄凉。
0 diet PvUxR     
n.饮食，节食，议会&vt.照规定饮食&vi. 忌食
参考例句：
  • Are you on a diet again?你又在节食了吗？
  • You need a balanced diet.你需要均衡的饮食。
0 dig CvCxX     
v.挖（洞，沟等）；掘
参考例句：
  • It is difficult to dig the ground when it is frozen.地面冻住了就不易挖掘。
  • In those days we often went to dig for wild vegetables.那时候我们常常出去挖野菜。
0 dinosaur xuSxp     
n.恐龙
参考例句：
  • Are you trying to tell me that David was attacked by a dinosaur?你是想要告诉我大卫被一支恐龙所攻击？
  • He stared at the faithful miniature of the dinosaur.他凝视著精确的恐龙缩小模型。
0 dinosaurs 87f9c39b9e3f358174d58a584c2727b4     
n.恐龙( dinosaur的名词复数 )；守旧落伍的人，过时落后的东西
参考例句：
  • The brontosaurus was one of the largest of all dinosaurs. 雷龙是所有恐龙中最大的一种。 来自《简明英汉词典》
  • Dinosaurs have been extinct for millions of years. 恐龙绝种已有几百万年了。 来自《简明英汉词典》
0 discovered 538416cf3bc59332670af4cae9485ebe     
v.发现( discover的过去式和过去分词 )；碰见；撞见；了解到
参考例句：
  • Marine life was discovered at depths previously thought to be azoic. 在先前被认为没有任何生命迹象的海洋深处发现了海洋生物。
  • They were discovered together in a compromising situation . 他们被人发现在一起，场面有伤风化。
0 discovery OucxW     
n.发现，发觉；被发现的事物；发明
参考例句：
  • I congratulate you on your great discovery.我祝贺你的伟大发现。
  • It is a discovery that made medical history.这是载入医学史册的重大发现。
0 during Dr7x3     
prep.在…期间，在…时候
参考例句：
  • What did you do with yourself during the summer holidays?暑假你是怎样度过的？
  • London is full of visitors during May and June.五六月间伦敦挤满了游客。
0 even EiUzR     
adj.平坦的，偶数的，相等的；adv.甚至，恰好，正当
参考例句：
  • It was cold yesterday,but it's even colder today. 昨天冷，今天更冷了。
  • He's the best teacher even though he has the least experience.尽管他经验最少，但教得最好。
0 example DixzW     
n.榜样，例子
参考例句：
  • Here is a simple example.这里有个简单的例子。
  • We should not follow his example.我们不应学他的榜样。
0 fact olRxe     
n.事实，实情，论据
参考例句：
  • It is close to fact.这更接近于事实。
  • I'm going there tomorrow,as a matter of fact.其实，我明天是准备去那里。
0 few kk0x2     
adj.很少的，不多的，少数的；int.少数的
参考例句：
  • There are few woods in that area.那个地区几乎没有森林。
  • I have a few questions.我有些问题要问你。
0 form dg5zW     
n.形式，形状，表格；v.形成，组成，建立
参考例句：
  • It is an art form.它是一种艺术形式。
  • My garden is in the form of a square.我的花园是方形的。
0 fossil ZipxA     
n.化石，食古不化的人，老顽固
参考例句：
  • At this distance of time it is difficult to date the fossil.时间隔得这么久了，很难确定这化石的年代。
  • The man is a fossil.那人是个老顽固。
0 fossils d5d4f38112df7c0c06bad64ca6f85f2a     
n.化石( fossil的名词复数 )；老顽固；食古不化的人；老古董（老人）
参考例句：
  • fossils over two million years old 两百多万年的化石
  • The geologist found many uncovered fossils in the valley. 在那山谷里，地质学家发现了许多裸露的化石。 来自《简明英汉词典》
0 found 8i5xD     
v.建立，创立，创办；vbl.(find的过去分词)找到
参考例句：
  • I found him at home.我发现他在家。
  • The United Nations was found in 1945.联合国于1945年成立。
0 frog Rhmxs     
n.青蛙，蛤蟆
参考例句：
  • He can see the frog.他能看见这只青蛙。
  • Frog can live both on land and in water.青蛙既能生活在陆地上也能生活在水中。
0 frogs bf9990695b6c6c88406557bc17a83f7c     
n.蛙( frog的名词复数 )；（对法国人的蔑称）
参考例句：
  • the croaking of frogs 蛙鸣
  • He wrote a learned book on frogs. 他写了一部有关青蛙的学术著作。 来自《简明英汉词典》
0 further tfjz8     
adv.（在时间或空间上）距离更大地；更远地
参考例句：
  • Have you had any further news?你有进一步的消息吗？
  • We will help you further.我们会进一步帮助你的。
0 geologic dg3x9     
adj.地质的
参考例句：
  • The Red Sea is a geologic continuation of the valley.红海就是一个峡谷在地质上的继续发展。
  • Delineation of channels is the first step of geologic evaluation.勾划河道的轮廓是地质解译的第一步。
0 hunters 292275af5b3a2c2529de04adcf036dc1     
n.猎人( hunter的名词复数 )；猎犬；猎狐马；搜集某种东西的人
参考例句：
  • prehistoric hunters and gatherers 史前的狩猎者和采集者
  • The male hunters brought back the food for their womenfolk to cook. 男猎手们带回食物让他们的女人烹调。
0 important wcIzI     
adj.重要的；重大的；严重的
参考例句：
  • It's important to find out what he is doing.弄清他在干什么是重要的。
  • This is a very important problem.这个问题很重要。
0 includes bb2b21ef7774df8687ff02b0284505c6     
v.包括( include的第三人称单数 )；包含；列入；包住
参考例句：
  • a superb health spa which includes sauna, Turkish bath and fitness rooms 内设桑拿浴室、土耳其浴室和健身房的第一流的休闲健身中心
  • The cost includes transit. 成本中包括运费。
0 information QQ5zY     
n.起诉；信息，消息；知识；报告，通知，情报
参考例句：
  • I hope the information I gave you was helpful.我希望我给你的消息对你有所帮助。
  • We must get further information.我们必须获得更多的消息。
0 it's MqtzUn     
(=it is；it has)
参考例句：
  • In "It's a bloody miracle!", "bloody" is used as an intensive word. 在“It‘s a bloody miracle！”一句中，bloody是用作加强语气的词。
  • According to Mick, it's a great movie. 据米克说，这是一部了不起的电影。
0 known hpKzdc     
adj.大家知道的；知名的，已知的
参考例句：
  • He is a known artist.他是一个知名的艺术家。
  • He is known both as a painter and as a statesman.他是知名的画家及政治家。
0 large W2JxL     
adj.大的，大量的，宽大的
参考例句：
  • How large is this room?这个房间有多大？
  • How large is your house?你家住房多大？
0 largely 72SxM     
adv.大部分，主要地
参考例句：
  • It is largely dependent on the weather.这多半取决于天气情况。
  • Their conclusions were largely founded on guesswork.他们的结论大部份基于猜测。
0 late GxFyK     
adj.迟的，晚的；已故的；adv.很晚，很迟，晚
参考例句：
  • Why are you so late?你为什么这样晚呢？
  • I'm a little late.我有点迟了。
0 lead 0Rrzf     
v.引导，致使；领导
参考例句：
  • She is a lead singer in a pop group.她是流行歌曲演唱团体的最重要的歌手。
  • Excuse me，does this road lead to the railway station?请问，这条路通向火车站吗？
0 learning wpSzFe     
n.学问，学识，学习；动词learn的现在分词
参考例句：
  • When you are learning to ride a bicycle,you often fall off.初学骑自行车时，常会从车上掉下来。
  • Learning languages isn't just a matter of remembering words.学习语言不仅仅是记些单词的事。
0 length D3By1     
n.长度，长；期间，一段；程度，范围
参考例句：
  • We need a length of pipe.我们需要一节管子。
  • The length of this pencil is 17-centimetre.这铅笔17厘米长。
0 life C1LxR     
n.生活；生命
参考例句：
  • The doctor came in time to save his life.医生及时来抢救他的生命。
  • At last he knew the meaning of life.终于，他知道了生命的意义。
0 lifestyle EpYzOF     
n.生活方式
参考例句：
  • She had to change her lifestyle and eating habits.她必须改变生活方式和饮食习惯。
  • She had come to enjoy Roberto's luxurious lifestyle.她渐渐地喜欢上了罗伯托奢侈的生活方式。
0 lived e22864336bd8b265bcd2d0435462e1f4     
adj.有…之生命的v.活( live的过去式和过去分词 )；居住；以…为生；（按照规矩）管理生活
参考例句：
  • The monks lived a very ascetic life. 僧侣过着很清苦的生活。
  • They were very curious about the people who lived upstairs. 他们对住在楼上的人感到很好奇。
0 million D7QzO     
num.百万，100万；n.无数，大众
参考例句：
  • I've seen it a million times.我在书上看过无数遍了。
  • What will you do if you had a million dollars?如果你有一百万美元，你会干什么？
0 most 9nczju     
adj.最多的（many，much的最高级）
参考例句：
  • Most students like pop songs.大多数学生喜欢流行歌曲。
  • Math is the most difficult.数学是最难的。
0 nature AGZxy     
n.自然，自然界，自然状态；本性，天性，性质；质；性格；性；本质
参考例句：
  • Man has been trying to control nature.人类一直在努力控制自然。
  • It's man's nature.这是人的本性。
0 nerves YnAzEB     
n.神经紧张 vt.鼓起勇气
参考例句：
  • What he said at the meeting strung her nerves up. 他在会议上的发言使她的神经很紧张。
  • At the end of a day's teaching, her nerves were absolutely shattered. 教了一天课，她精疲力竭。
0 only bIzxE     
adv.仅仅，只不过；adj.唯一的；conj.可是，不过
参考例句：
  • We have only one earth.我们只有一个地球。
  • I only found it by accident.我只是碰巧找到的。
0 organism PRKzX     
n.生物，有机体；(如生物的)机体、有机组织
参考例句：
  • The economy is not a mechanical device but a living organism.经济不是一套机械装置,而是活的有机体。
  • Selection will root out such organism.自然选择将把这些物种消灭掉。
0 organisms dfef3badf2de1f4317a67a23dc17bbc8     
n.有机物( organism的名词复数 )；有机体；生物；有机体系
参考例句：
  • The organisms can be divided into discrete categories. 有机体可分为许多互不相联的种类。
  • The cell is the unit of which all living organisms are composed. 细胞是构成一切生物的单位。
0 past 1Loxa     
n.过去，昔时，往事，早年经历，过去时；adj.过去的，结束的，卸任的，过去时的；prep.越过，晚于，超越，超出...的可能性（能力、范围等）；pass的过去分词
参考例句：
  • We walked past the hospital.我们从医院旁边经过。
  • The past is past.Let us look ahead.过去的事已成过去。让我们向前看吧。
0 period vMNx3     
n.学时，课时；一段时间，时期，周期；句点
参考例句：
  • Trade is always good over the Christmas period.圣诞节期间生意一向很好。
  • He nursed the company through a difficult period.他帮助公司渡过了一段困难时期。
0 permit jMixB     
n.许可证，许可，执照；vt.允许，容许；vi.容许
参考例句：
  • The doctor will not permit mother up until her leg is better.在母亲的腿好些之前,医生不允许她起床。
  • The soldiers had orders to permit no stranger through.士兵们接到命令不许任何陌生人通过。
0 preserve 21izC     
vt.保护，保持，保存，保藏；vi.做蜜饯，禁猎；n.蜜饯，果酱，禁猎地，禁区，防护物
参考例句：
  • What can we do to preserve the company from ruin? 我们怎么做才能保护这家公司不破产？
  • It is the duty of the police to preserve public order.维护公共秩序是警察的职责。
0 preserved preserved     
adj.保存的, 蜜饯的, 腌制的 动词preserve的过去式和过去分词
参考例句：
  • Their music has been preserved for posterity . 他们的音乐已为后世保存起来。
  • Sardines can be eaten fresh but are often preserved in tins. 沙丁鱼可以吃新鲜的，但常常是装听的。
0 providing RksznB     
conj.如果；假如；在…条件下；倘若v.提供，供给，供应( provide的现在分词)；规定；提供[(+for)]；装备
参考例句：
  • The city is providing free transportation to the stadium from downtown. 本市现在提供从市中心到体育场的免费交通。
  • The system is directed to providing help for old people. 这种制度的目的是为老人们提供帮助。 来自《简明英汉词典》
0 province ktBye     
n.省；地方
参考例句：
  • Yunnan province is the home of elephants.云南省是大象的生息地。
  • Jinan is the capital of Shandong Province.济南是山东省省会。
0 publication xScxx     
n.出版，发行；出版；公布，发表
参考例句：
  • They don't think this article is suitable for publication.他们认为这篇文章不宜发表。
  • The government has delayed publication of the trade figures.政府已将贸易统计数字延后公布。
0 ranch dAUzk     
n.大牧场，大农场
参考例句：
  • He went to work on a ranch.他去一个大农场干活。
  • The ranch is in the middle of a large plateau.该牧场位于一个辽阔高原的中部。
0 rarely tT2x4     
adv.很少，难得；非常地，非凡地
参考例句：
  • Such fish is rarely met with in the north country.这种鱼在北方难得看到。
  • He rarely comes here anymore.现在他难得来这儿了。
0 recently kkvzIc     
adv.近来，最近
参考例句：
  • The book was published as recently as last week.这本书上周刚出版。
  • The weather has been very snowy recently.近来天气多雪。
0 remained bd5fe28fe00e6dc5a8156604f3d6e66b     
v.留下( remain的过去式和过去分词 )；保持；留待；仍然是
参考例句：
  • She remained quiet and controlled. 她沉默不语保持克制。
  • She remained dry-eyed throughout the trial. 整个审讯过程中她没掉一滴眼泪。
0 remains 1kMzTy     
n.剩余物，残留物；遗体，遗迹
参考例句：
  • He ate the remains of food hungrily.他狼吞虎咽地吃剩余的食物。
  • The remains of the meal were fed to the dog.残羹剩饭喂狗了。
0 reported 2kLzWG     
adj.据报告的，据报导的，据传闻的
参考例句：
  • Ten new cases of bird flu were reported yesterday. 昨天新增十例禽流感病例报告。
  • Renewed fighting has been reported on the border. 据报道，在边境地区战火重燃。
0 said IYtxh     
v.动词say的过去式、过去分词
参考例句：
  • He said to me that he could not come.他对我说他不能来。
  • He said to his mother that he would do it by himself.他对他的母亲说他将自己独立做那件事。
0 scientific xZIxd     
adj.科学的；符合科学规律的，精确的
参考例句：
  • Most students in our class go in for scientific activities.我们班上大多数学生参加各项科学活动。
  • Look at the matter purely from the scientific point of view.用科学眼光看待事物。
0 scientists 0d40887127bee8f7731f5c4f95eb5331     
n.科学家( scientist的名词复数 )
参考例句：
  • Scientists have established a connection between cholesterol levels and heart disease. 科学家已证实胆固醇含量与心脏病之间有关联。
  • Scientists disagree about how the universe was created. 科学家对宇宙是怎样形成的有分歧。
0 seen ujyzZX     
vbl.(see的过去分词)看见
参考例句：
  • Since I left college, I have not seen him.自从我离开大学以后，就没有见过他了。
  • I hope to have seen the film next week.我希望下星期能看到这部电影。
0 show KyYwa     
v.出示；告知；n.展览（会）；演出，节目
参考例句：
  • Please show me your card.请出示你的卡片。
  • Have you seen the show?你看演出了没？
0 similar oyPwO     
adj.类似的；同样的
参考例句：
  • The two boys look very similar.这两个孩子看上去很相似。
  • A cat is similar to a tiger in many respects.猫和虎在很多方面相似。
0 size OxQwp     
n.尺寸，大小；v.按大小排列或分类
参考例句：
  • I think I can find the right size for you.我想我能给你找到合适的尺码。
  • This room is twice the size of that one.这间屋子有那间两个大。
0 soft 3wfwl     
adj.柔软的，温和的，不强烈的，细腻的，轻的；adv.柔软地，温和地；n.柔软的东西
参考例句：
  • I'd prefer a soft drink.我喜欢喝软饮料。
  • It's pleasant to walk in soft snow.在松软的雪里走很舒服。
0 southern lwgwP     
adj.南部的，南方的，来自南方的
参考例句：
  • They live in the southern area.他们住在南部地区。
  • He has traveled in southern cities.他游历了南方各市。
0 species FTizN     
n.物种，种群
参考例句：
  • Are we the only thinking species in the whole of creation?我们是万物中惟一有思想的物种吗？
  • This species of bird now exists only in Africa.这种鸟现在只存在于非洲。
0 stage eucww     
n.阶段，舞台，时期；vt.上演，表演
参考例句：
  • She was mad about the stage.她狂热地迷恋着舞台生活。
  • Take it easy when you are on the stage.上台的时间不要紧张。
0 stages 2c51692ad4108bff1e2376f585ccb4f8     
n.台( stage的名词复数 )；舞台；站；阶段
参考例句：
  • the closing stages of the game 比赛的结束阶段
  • The project is still in the early stages. 这个项目仍处于初期阶段。
0 structure PtNw5     
n.结构，构造，建筑物；v.构成；
参考例句：
  • Doctors study the structure of the human body.医生研究人体构造。
  • A flower has quite a complicated structure.一朵花的结构相当复杂。
0 study htIw1     
vt.学习；研究；细看；vi.读书；n.学习；研究
参考例句：
  • He helps me study English.他帮助我学习英语。
  • His wish to study music has come true.他学习音乐的愿望实现了。
0 suggest nsDw2     
vt.提议，建议，促成，暗示，启发，使人想起
参考例句：
  • I suggest trying once more.我建议再试一次。
  • I suggest you save your breath.我劝你少开口。
0 tadpole GIvzw     
n.[动]蝌蚪
参考例句：
  • As a tadpole changes into a frog,its tail is gradually absorbed.蝌蚪变成蛙，它的尾巴就逐渐被吸收掉。
  • It was a tadpole.Now it is a frog.它过去是蝌蚪，现在是一只青蛙。
0 tadpoles 1abae2c527b80ebae05cd93670639707     
n.蝌蚪( tadpole的名词复数 )
参考例句：
  • The pond teemed with tadpoles. 池子里有很多蝌蚪。 来自《简明英汉词典》
  • Both fish and tadpoles have gills. 鱼和蝌蚪都有鳃。 来自《现代汉英综合大词典》
0 though lIRzS     
conj.虽然，尽管；即使；可是，不过，然而；adv.可是，不过，然而
参考例句：
  • It's quite pleasant today,though the wind is rather cool.尽管风有点凉，今天天气还是很不错的。
  • I will have a try even though I should fail.哪怕失败，我也要试一下。
0 tissue bJmzs     
n.组织；薄纱，薄纸，手巾纸
参考例句：
  • As we age we lose muscle tissue.肌肉组织会随着我们日趋衰老而萎缩。
  • Athletes have hardly any fatty tissue.运动员几乎没有什么脂肪组织。
0 tissues 79654ca5ba0bc2dbc0ee54a48bab4e31     
n.组织( tissue的名词复数 )；薄纸；棉纸；一套
参考例句：
  • The teacher showed the students the pictures of brain tissues. 老师给学生们看脑组织的图片。 来自《简明英汉词典》
  • Give some face tissues to me. 给我些面巾纸。 来自《简明英汉词典》
0 toads 848d4ebf1875eac88fe0765c59ce57d1     
n.蟾蜍，癞蛤蟆( toad的名词复数 )
参考例句：
  • All toads blink when they swallow. 所有的癞蛤蟆吞食东西时都会眨眼皮。 来自《简明英汉词典》
  • Toads have shorter legs and are generally more clumsy than frogs. 蟾蜍比青蛙脚短，一般说来没有青蛙灵活。 来自辞典例句
0 was bglwv     
v.(is,am的过去式)是，在
参考例句：
  • He said he was right.他说他是正确的。
  • He was cold and hungry.他又冷又饿。
0 words se0zHk     
n.字( word的名词复数 )；（说的）话；诺言；口令
参考例句：
  • What were his actual words? 他的原话是什么？
  • Single words are the building blocks of language. 单词是语言结构的基本单位。
0 world hfPw4     
n.世界
参考例句：
  • We have friends all over the world.我们的朋友遍天下。
  • Welcome to my small world.欢迎光临我的小天地。
0 writer Gf8wF     
n.作家，记者，撰稿者，抄写员
参考例句：
  • Dickens was a famous English writer.狄更斯是英国著名作家。
  • He is a very popular writer but I don't like his style.他是个很受欢迎的作家，但我不喜欢他的文风。
0 years 75aeb98e5241592ad6a6c2c4c78a16ef     
n.年( year的名词复数 )；年纪；一年的期间；某年级的学生
参考例句：
  • She is still very active, in spite of her advancing years. 她尽管年事渐高，仍然十分活跃。
  • Travelling in Europe was something of an anticlimax after the years he'd spent in Africa. 他在非洲生活了多年，到欧洲旅行真是有点太平淡了。

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