Ø round the clock(=all day and all night, usually without stopping) 昼夜不停地
　　 This is a terrific mission and we are very busy doing science round the clock.
　　 Ø comment on sth评论
　　 Everyone commented on her new hat.
　　 大家都在评论她的新帽子。
　　 He commented on the bad road.
　　 他评论这条糟糕的路。
　　 Ø commit oneself to致力于
　　 I commit myself to strive for grades of “C” or better in all my high school classes and to benefit fully from the classes offered during the summer program.
　　 Ø commit sb to prison把某人送进监狱;
　　 A robbery was committed to prison last night.
　　 昨晚发生了一个强盗被送入了监狱。
　　 Ø to commit oneself to a promise 受诺言的约束
　　 Ø in common (和…)有共同之处,共用
　　 We have many things in common.
　　 Ø common touch n. 平易近人的特性
　　 An effective administrator and also an effective leader, with a common touch
　　 有效的行政人员，也是有效的领导者，通常有平易近人的品质
　　 Ø be common to sb 是与某人所共有的
　　 Ø keep company with (=be friendly and go out together) 和…要好
　　 If you keep company with a person or with a particular kind of person, you spend a lot of time with them.
　　 Ø compare A with B 把…与…比较
　　 compare one thing with another
　　 将一物与另一物比较
　　 Ø compare A to B 把…比作…
　　 Man’s life is often compared to a candle.
　　 人生常被喻为蜡烛。
　　 Ø by comparison(with) 比较起来
　　 He puffed the new system by showing how badly his existing system performed by comparison.
　　 Agricultural productivity remained low by comparison with advanced countries like the United States.
　　 Ø in comparison with (=in contrast to) 和…比起来
　　 They were living rather well, in comparison with people elsewhere in the world.
　　 Ø compensate for (=give sth to make up for) 补偿, 赔偿,弥补
　　 Nothing can compensate for the loss of one’s health.
　　 一个人失去了键康是不可弥补的。
　　 Ø compensate sb for sth 赔偿,弥补
　　 Management compensated us for the time we worked. 资方补偿我们工作时间的报酬
　　 Ø complain to sb about/of sth 向某人抱怨…
　　 Jean is always complaining about something.
　　 琼总是满腹牢骚。
　　 Ø comply with (=act in accordance with a demand, order, rule etc) 遵守, 依从
　　 You must comply with the library rules.
　　 遵守图书馆的规则。
　　 Ø In compliance with 顺从, 遵守, 依从
　　 Compliance with the law is expected in the state.
　　 该州要求人人守法。
　　 Ø conceive of (think of, imagine, consider)设想
　　 Half a century ago it’s difficult to conceive of travelling to the moon半个世纪前去月球旅行是难以想象的。
　　 Ø be concerned with (=about) 关心 关注
　　 We’re rather concerned about father’s health. 我们相当担心父亲的健康。
　　 Ø concern oneself about 关心 (concern及物)
　　 We’re rather concerned about father’s health.
　　 我们相当担心父亲的健康。