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重点讲解：
1. back out of
收回(诺言等)；退出；撤出；取消；不履行
eg. He has decided to back out of the scheme.
他决定退出这项计划。
eg. It is too late to back out of the deal.
现在打退堂鼓为时已晚。
2. get cold feet
沮丧，临阵退缩；
eg. Even the best athletes can get cold feet before a big game.
就算是最好的运动员，也会在大型比赛开始前觉得紧张。
eg. He got cold feet at the last minute.
他事到临头却退缩了。
3. by the way
顺便说一下；
eg. The name Latifah, by the way, means 'delicate'.
顺便说一句，Latifah 这个名字意思是“娇嫩”。
eg. By the way, how did your seminar go?
对了，你的研讨会进行得怎样？
