1.by chance (= accidentally， by accident) 偶然
2.considerate (=thoughtful of the needs ) 体贴的，考虑他人需要的，considerable相当大的，值得考虑的
3.consist of (=be composed of ) 由……组成的。consist in主要在于。consist with符合，与……一致
4.be consistent with (=be in agreement with) 与……一致。be consistent in一贯的
5.consult sb. on/ about sth. 向……征求……方面的意见，就……向……请教
6.to one‘s heart’s content 尽情地，痛痛快快
7.round the clock (=all day and all night， usually without stopping) 昼夜不停地
8.comment on评论
9.commit oneself to 使自己承担…… commit sb. to prison 把某人送进监狱;commit one‘s idea to writing 把某人的想法写下来;commit a matter to a committee 把某事交给委员会讨论
10.in common (和……)有共同之处，共用
be common to sb. 是与某人所共有的
11.keep company with (=be friendly and go out together) 和……要好
12.compare……with…… 把……与……比较
13.compare……to…… 把……比作……
14.by comparison 比较起来
15.in comparison with (=in contrast to) 和……比起来
16.compensate for (=give sth. to make up for) 补偿，赔偿，弥补 compensate sb. for sth. 赔偿，弥补
17.complain of (or about) 抱怨;诉苦;控告;complain about 抱怨某人或事情;complain to sb. about sth. (or sb.) 向某人抱怨……;complain(抱怨);complement(补充);compliment(恭维)
18.comply with (=act in accordance with a demand， order， rule etc.) 遵守，依从
19.conceive of (think of， imagine， consider) 想象，设想
20.concentrate on (or upon) 集中，专心
