1.calm down：冷静下来
I won't discuss the matter with you befor you calm down.
在你冷静下来之前我不会跟你讨论这件事情。
替换短语：cool dwon：冷静下来
I won't discuss the matter with you befor you cool down.
在你冷静下来之前我不会跟你讨论这件事情。
混淆短语：keep calm：保持安静
Please keep calm in the library.
在图书馆请保持安静。
2.carry on：继续
They will try to carry on the project in spide of budget deficiency.
即使经费短缺，他们还是会设法继续这项计划。
混淆短语：carry out：执行
They will try to carry on the project in spide of gudget dificiency.
即使经费短缺，他们还是会设法完成这项计划。
3.cast away：（1）丢掉；（2）浪费
（1）They cast away some furniture when they moved.
他们搬家的时候丢掉了一些家具。
（2）His parents advised him against casting away his time.
他的父母劝他不要浪费时间。
4.catch a chill：着凉，感冒
He caught a chill last week and has been coughing since then.
他上周感冒了，从那时起就一直在咳嗽。
替换短语：catch a cold：感冒，着凉
He caught a cold last week and has been coughing since then.
他上周感冒了，从那时起就一直在咳嗽。
5.collect oneself：心平气和，镇定一下
The man could hardly collect himself when seeing the girl.
男子看到这个女孩几乎不能使自己镇定下来。
6.challenge sb. to a duel：要求某人参加决斗
Mike challenged him to a duel for a woman.
迈克为了一个女人要求他参加决斗。
混淆短语：accept a challenge：应战
This is not an easy task， but I decide to accept a challenge.
这不是个简单的任务，但我决定接受挑战。
7.cheer up：（1）振作起来！（2）使高兴
（1）Cheer up! A failure in love is not big deal！
振作一点！失恋没什么大不了的！
（2）I don't kown how to cheer him up.
我不知道怎么让他高兴起来。
8.cheese sb. off：使某人厌烦、烦恼、灰心
His same old joke really cheesed me off.
他老掉牙的笑话真的很让我厌烦。
9.choke dwon：（1）强咽下去；（2）忍受
（1）She didn't like the food but choked it down out of polite.
她不喜欢那些食物，出于礼貌还是勉强咽下去了。
（2）I can hardly choke down his impolite attitude toward the elders.
他难以忍受他对长辈无理的态度。
10.chop sth. down：砍倒某物
They decided to chop all the trees down and build a shopping center.
他们决定砍倒所有的树并建一个购物中心。