三思而后行
Look before you leap。
三句不离本行
to talk shop
三个臭皮匠胜过一个诸葛亮
Two heads are better than one。
三番两次
This guy is at me time after time。(time and again; time and time again。)
三缄其口
You'd better hold your peace, or you'll ask for trouble。
千钧一发
to hang by a hair thread / at the critical time
千锤百炼
A good nail does not fear the hammer. (steeled and tempered; gone through fire and water)
千载难逢
It only happens once in a blue moon. (It chances in an hour that happens not in seven years。)
千变万化
The unexpected always happens。
大刀阔斧
It's said that the new executive will go the whole hog (reform in a big way。)
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