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Contemporary Standard Chinese Dictionary
- 一旦
[yídàn]
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1.
名
一天之内，指很短的时间内
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强烈的地震，使一座上百年的城市毁于一旦。
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2.
名
指不确定的某一天
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同窗五载，一旦分别，心里很不好受。
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此处一旦塌方，后果不堪设想。
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Examples
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一旦无常万事休。
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When death comes, everything is ended.
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坏习惯一旦养成，需要很长的时间才能根除。
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A bad habit once contracted takes a very long time to uproot (or root up).
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做好准备，一旦有事，马上出动。
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Get prepared so that you can set off immediately if something happens.
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新制度一旦产生，便会推动旧制度的崩解。
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The creation of a new system will further the collapse of the old one.
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赛场上一旦进攻乏力，那还怎么得分啊！
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If a team is incapable of launching an attack, how can it score in the game?
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我们这个工作小组分属两个部门，一旦发生问题，责任很难分清。
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Our group belongs to two separate departments at the same time. If there is a problem, it will be hard to determine whose responsibility it is.
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他平时平易近人，可一旦发起脾气来也不是好惹的。
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He is usually easy-going, but he is difficult to deal with when he gets angry.
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学生一旦违反校纪，就将受到严厉惩处。
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The students will be severely punished if they break school regulations.
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金属器皿一旦有了硬伤往往很难消除。
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Once damaged, metal containersare not easily repaired.
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Collocations
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毁于一旦
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to be destroyed
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一旦醒悟
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once somebody has come to realize
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一旦发生
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once something happens
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