命在旦夕，汉语成语，拼音是 mìng zài dàn xī，形容极短的时间。生命垂危，很快会死去。出自唐·陈子昂《为建安王与诸将书》。
医生告诉我那位老人命在旦夕了。
当你的朋友命在旦夕，救人一命实在不算什么英雄但是只是竖立一面国旗？
All your friends dying. it's hard enough to be called a hero for saving somebody's life. But for putting up a pole?
如果你找不到那把巨小的螺丝刀，那你孩子带发光二极管的玩具可就命在旦夕了。
Your children's toys equipped with LEDs are in extreme danger if you can ever find that tiny screwdriver.
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