1、Words ReviewRead the explanation and speak out the word it explains.based on chance rather than being planned or based on reason to get sth.,especially by asking for it,buying it,working for it or producing it from sth.else an important discovery or event that helps to improve a situation or provide
2、 an answer to a problem breakthroughn.突破proceduren.程序；步骤；手续obtain vt.获得；赢得arbitraryadj.任意的a set of actions which is the official or accepted way of doing sth.a change made to sth.in order to correct or improve it,or when you make such a change to do or begin to do sth.,especially sth.that will take
3、a long time or be difficult commercialadj.商业的；贸易的undertakevt.着手；从事；承担mediumn.媒介；手段；工具related to buying and selling things a method or way of expressing sth.correction n.改正；纠正；修正objectionn.不赞成；反对；异议accumulatevt.&vi.积累；聚积castvt.扔；投；掷to collect a large number of things over a long period of time to fee
4、l or express opposition to or dislike of sth.or someone to throw sth.conservativeadj.保守的；守旧的often not liking or trusting change,especially sudden change vi.反对；不赞成 objectwhen someone expresses or feels opposition to or dislike of sth.or someone in great detail,or complete,correct or true in every way
5、 exactadj.精确的；准确的carriern.携带者；搬运工；运输工具altogetheradv.总共；完全地completely or in total a person or thing that carries sth.moraladj.道德(上)的；伦理的relating to the standards of good or bad behaviour,fairness,honesty,etc.which each person believes in,rather than to laws straight-forwardadj.简单的；直接的；坦率的easy to unde
6、rstand or simple vt.获得；到达（水平、年龄、状况等）used to describe two similar things that are a pair to reach or succeed in getting sth.;to achieve forbidvt.禁止；不准attainadj.成对的；成双的twineither of two children born to the same mother on the same occasionto refuse to allow sth.,especially officially,or to prevent a particular plan of action by making it impossible n.双胞胎之一；孪生儿之一
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