Unit 4 Astronomy Word Study1. science subjects1. science subjectssubjectChinesescientistmathematics数学 (maths)mathematician physics物理学physicist chemistry化学chemist biology生物学biologist geology地质学geologist biochemistry生物化学biochemist astronomy天文学astronomer2. system n.(1) 系统; 体系solar system 太阳系the banking system 银行系统(2) 制度educational / social system 3. theory n. 理论;学说 the theory of relativity 相对论the theory of evolution 进化论 在理论上在实践中 in practicein theory4. atom n. 原子 atomic adj. 原子的；核能的 atomic bomb 原子弹atomic energy核能 5. billion n. 十亿 two/ several billion dollars billions of dollars millionaire 百万富翁 billionaire 亿万富翁6. globe n. 地球;地球仪 tourists from every corner of the globe global adj. 全球的 地球村全球变暖the global villageglobal warming7.violent adj. 8. (1) 猛烈的;激烈的a violent storm / earthquake a violent quarrel(2) 暴力的violent crimeviolence n. 暴力 8.in time 9. (1) 及时in time for sth. / to do sth. 来得及做某事Luckily, we were in time for the train.Luckily, we were in time to catch the train.(2) 总有一天；迟早Im sure things will get better in time.与time相关的短语:立刻, 马上有时每次;一次从前 按时;准时曾经暂时不时地 in no timeat timesat a timeonce upon a timeon timeat one timefor the time beingfrom time to time9. atmosphere n.(1) 大气（层） atmosphere pressure 大气压力 (2) 气氛 There is an unpleasant atmosphere in the office today.10. unlike prep. 不像；不同 dislike v. 讨厌；不喜欢Unlike John, Tom dislikes playing football.12. fundamental adj. 基本的，基础的the fundamental rules of grammarbe fundamental to 是的基础Hard work is fundamental to success. 13. presence n. 出席;出现；到场在某人面前；当着某人的面John feels uneasy in the presence of strangers.present adj. 出席的；到场的 be present atin ones presence in the presence of sb.14.chain n. v. （1）链子（2）一系列；一连串的（事或物）a chain reaction 连锁反应 （3）连锁店 Wal-mart has many chains all around China. （4）用链拴住 He chained his bicycle to the post.a gold chain15. reaction n. 反应；回应What is his reaction to your proposal?react v. How did your mother react to the news?16. multiply v. （1）乘（2）增加（3）繁殖 Some animals multiply rapidly.If you multiply 5 by 2 , the answer is / equals / makes 10.You can multiply your profit in this way.17. lay eggs 下蛋 lay v. (laid ; laid)lay down 放下 She laid the baby down gently on the bed. lay aside 搁置, 积蓄 Every week he lays aside a few dollars for his old age. lay off 解雇，下岗 In the financial crisis, the company laid off some workers.18. exist vi. 存在；生存There is no evidence that life exists on other planets.They existed on bread and water for a month.existence n. 存在；生存=come into beingcome into existence 开始存在；出现