南轅北轍
cross purposes：The salesmen were working at cross purposes with their supervisor.

病從口入禍從口出
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，不怕沒(méi)柴燒
Where there's life there's hope

海底撈月
to fish in the air

海底撈針
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.

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

殺雞焉用牛刀
Take not a musket to kill a butterfly?

小Car筆記：
a bundle of：一捆(一扎，一包)
as good as：和 ... 幾乎一樣
virtue：德行，貞操，美德 【常用短語(yǔ)】①public virtue 公德 ②make a virtue of necessity 把非做不可的事裝成出于好心才做的 ?③of easy virtue 不貞節(jié)的，水性揚(yáng)花的

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