controversial
controversial 引起争论的，有争议的
【巧记】contro 反，vers 转跟别人反着转引起争论的
【语境】Many of the new taxes are controversial. 许多新税收都是有争议的。
convenient
convenient 方便的
【巧记】反义词：inconvenient, unhandy
【语境】Will it be convenient for you to come in the morning? 你上午来方便吗?
A bicycle's often far more convenient than a car in busy cities. 在热闹的都市里骑自行车往往比坐汽车方便得多。
convention
convention 习俗，惯例;(正式)会议;公约，契约
【巧记】派生词：conventional(a. 依照惯例的，约定俗成的)
Convention requires that such meetings open with prayers. 惯例上要求这样的集会应当以祈祷开始。
conventional
conventional a. 惯例的，常规的
【巧记】派生词：conventionalist(拘泥习俗[因循守旧]的人)conventionality(惯例性;习俗)
【语境】Nowadays plastics have taken the place of many conventional materials. 现在塑料已代替了许多传统材料。
conversation
conversation 谈话
【语境】He is easy in conversation and graceful in manner. 他谈吐从容，举止优雅。
【考点】have/hold a conversation with 和交谈[会谈] in conversation with(在)和……谈话
cooperate
cooperate 合作，协作
【语境】Everything cooperated to make our holiday a success. 这一切凑合起来使我们的假期圆满过去。
We want to cooperate with you greatly. 我们非常愿意与你们合作。
【考点】cooperate with sb. (in doing sth./to do sth.) 和别人合作
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