南辕北辙
cross purposes：The salesmen were working at cross purposes with their supervisor.

病从口入祸从口出
Illness comes in by mouth and comes out by it.

笑里藏刀
a smile to hide one's hate

留得青山在，不怕没柴烧
Where there's life there's hope

海底捞月
to fish in the air

海底捞针
to look for a needle in a bundle of hay

差之毫厘失之千里
A miss is as good as a mile

既往不咎
Let the dead bury their dead.

杀身成仁
to sacrifice one's life to preserve one's virtue complete

杀鸡焉用牛刀
Take not a musket to kill a butterfly 

小Car笔记：
a bundle of：一捆(一扎，一包)
as good as：和 ... 几乎一样
virtue：德行，贞操，美德 【常用短语】①public virtue 公德 ②make a virtue of necessity 把非做不可的事装成出于好心才做的  ③of easy virtue 不贞节的，水性扬花的

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