旦夕，即早与晚，比喻短时间内。如成语“危在旦夕”、“天有不测风云，人有旦夕祸福”、“旦夕之间”、“偷安旦夕”等，都是指时间很短的意思。
如果你找不到那把小螺丝刀，你孩子那带着发光二极管的玩具可就危在旦夕了。
Your children's toys equipped with LEDs are in extreme danger if you cannot ever find that tiny screwdriver.
现在利比亚人民的未来危在旦夕。
The stakes in Libya are obviously high for the future of the Libyan people.
全球变暖使得考古宝藏危在旦夕。
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