科学美国人60秒 SSS 2013-09-11
时间：2013-11-25 05:23:14
搜索关注在线英语听力室公众号：tingroom，领取免费英语资料大礼包。
（单词翻译）
In the east African savanna1, pools of water form during the rainy season only to dry up a few months later. Being a fish in one of these temporary ponds is a challenge. To survive, they race to maturity2, with the shortest generation time of any vertebrate.
To monitor the development of the so-called annual fish, researchers raised two different species in the lab.
The fish could grow by almost a quarter of their body length each day. One species could already reproduce at 17 days of age. The other took an additional day. The eggs these youngsters
fertilized3 then hatched in as little as 15 days, leaving only a month between generations. The study is in the journal EvoDevo.
Embryonic4 annual fish survive the dry season by lying
dormant5 underground. Once the rains return and the pool forms, they quickly reproduce before the water dries up again. Their short generation time is thus a crucial
evolutionary6 adaptation. Their temporary ponds force them to live fast, die young and leave a desiccated
corpse7.
分享到：
Error Warning!
出错了
Error page: /?aid=237042&mid=3
Error infos: Got error 28 from storage engine
Error sql: select `l`.`tag`,`l`.`index`,`l`.`level_id`,`b`.`id`,`b`.`word`,`b`.`spell`,`b`.`explain`,`b`.`sentence`,`b`.`src` from `new_wordtaglist` `l` left join `new_word_base` `b` on `l`.`tag`=`b`.`word` where `l`.`arc_id`='237042' and `l`.`level_id`>='' group by `b`.`word` order by `l`.`index` asc
