一旦
一旦[yī dàn]1.■(一天之间) in a single day; in a very short time:be destroyed in one day;毁于一旦collapse overnight溃于一旦(不确定的时间) once; in case; now that:
一旦[yī dàn]1.■(一天之间) in a single day; in a very short time:be destroyed in one day;毁于一旦collapse overnight溃于一旦(不确定的时间) once; in case; now that:
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