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Step by Step 3000 第1册 Unit12:Dictation item(8)

时间：2015-05-18 05:56:50

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（单词翻译）

 　　Item eight.

　　Vocabulary. fossil, molecule1, hydrogen, carbon, sulfur2.
　　Petroleum3 has been important since ancient times.
　　In Latin, the name means "rock oil".
　　Petroleum is a fossil fuel.
　　The liquid comes from the remains4 of plants and animals that died millions of years ago.
　　These remains were buried deep bellow5 levels of rock over time and under great pressure.
　　This geological process created complex molecules6 of hydrogen and carbon.
　　Oil can also contain other elements.
　　Crude oil or unprocessed petroleum is called sour when it contains a lot of sulfur and impurity7.
　　Sour crude requires more refining than sweet crude which is often more valuable.

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1 molecule Y6Tzn     
n.分子，克分子
参考例句：
  • A molecule of water is made up of two atoms of hygrogen and one atom of oxygen.一个水分子是由P妈̬f婘̬ 妈̬成的。
  • This gives us the structural formula of the molecule.这种方式给出了分子的结构式。
2 sulfur ps4wC     
n.硫，硫磺（=sulphur）
参考例句：
  • Sulfur emissions from steel mills become acid rain.炼钢厂排放出的硫形成了酸雨。
  • Burning may produce sulfur oxides.燃烧可能会产生硫氧化物。
3 petroleum WiUyi     
n.原油，石油
参考例句：
  • The Government of Iran advanced the price of petroleum last week.上星期伊朗政府提高了石油价格。
  • The purpose of oil refinery is to refine crude petroleum.炼油厂的主要工作是提炼原油。
4 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。
5 bellow dtnzy     
v.吼叫，怒吼；大声发出，大声喝道
参考例句：
  • The music is so loud that we have to bellow at each other to be heard.音乐的声音实在太大，我们只有彼此大声喊叫才能把话听清。
  • After a while,the bull began to bellow in pain.过了一会儿公牛开始痛苦地吼叫。
6 molecules 187c25e49d45ad10b2f266c1fa7a8d49     
分子( molecule的名词复数 )
参考例句：
  • The structure of molecules can be seen under an electron microscope. 分子的结构可在电子显微镜下观察到。
  • Inside the reactor the large molecules are cracked into smaller molecules. 在反应堆里，大分子裂变为小分子。
7 impurity b4Kye     
n.不洁，不纯，杂质
参考例句：
  • The oxygen reacts vigorously with the impurity in the iron.氧气与铁中的杂质发生剧烈的化学反应。
  • The more general impurity acid corrosion faster.一般来说杂质越多酸蚀速度越快。

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