1.differ vi. 不同；相异 eg:Im afraid we shall have to differ. 我们在那个问题上跟他意见不同。 difference n. 不同，相异，差别 different adj. 不同的，相异的 be different from 与不同 2.exact adj. 精确的；准确的 eg：I want an exact translation of this sentence. 我要这一句子的确切翻译。 exactly adj. 精确地 mercial adj. 商业的；贸易的 eg：Myeong-dong is located in Seoul District,is the South Korean representative commercial trade place. 明洞位于首尔中区，是韩国代表性的商 业贸易地点 commercially adv. 商业上，通商上 plicated adj. 复杂的，难 懂的 a complicated machine 复杂的 机器 eg：The problem was complicated. 这个问题很复杂。 5.undertake vt. 着手；从事； 承担(undertook;undertaken) 同义词：set about 着手，开始 go in for 从事 undertaking n. 任务；承诺；丧葬事宜 undertaker n. 承办者，承担人；企业家 undertake to do 保证做 eg: He undertook to pay the money back within six months. 他保证六个月之内还钱。 6.pay off 得到好结果；取得成功；偿清 eg：It would take him the rest of his life to pay off the loan. 他得用余生来还清那笔贷款。 搭配： 1.pay as you go 付现款；量入为出 2.pay back 偿还（欠款），报答 3.pay (a person) back in his own coin 以其人之 道还治其人之身 4.pay up 付清，缴清 5.pay ones respects to 向致敬 7.breakthrough n. 突破 eg：The news caused a breakthrough in gold prices. 这个消息是金价暴涨。 8.cast vt. (cast;cast) 扔，投，掷 eg：The boy cast a stone against the window. 男孩往窗户上扔了一块石头。 搭配： cast down 使失望；使沮丧 cast away 抛弃；使（船）失事 cast back 回想，回忆，追溯 cast off 抛弃，扔掉；摆脱，不再和 来往 摆脱 get rid of 9.altogether adv. 总共；完 全地 eg：I dont altogether agree with him. 我不完全同意他。 10.forbid vt. (forbade,forbad;forbidden) 禁止 ；不准 eg：I cant fobid your seeing that man again. 我无法禁止你再和那个男人来往。 【反义词】permit vt. 准许 【搭配】 bring sth. into forbid (法律)生效，开始执行 forbid of habit (出于)习惯势力 forbid sth. down 强迫某人（自己）咽下；迫降 forbid sth. on sb. 强迫某人接受 in forbid 大量的，大批的 forbid back ones tears 强忍眼泪 【permit】 permit sth. eg:He doesnt permit noise in his room. 他不允许在他的房间吵闹。 permit doing eg:The teacher didnt permit smoking in the classroom. 老师不允许在教室抽烟。 permit sb. to do eg:The policeman permitted him to park there. 警察允许他在那里停车。