FluentPlex
Simplified or traditional characters, pinyin with or without tones (xuexi, xué xí), or English.

一旦

yī dàn word B2
  1. in case (sth happens)
  2. if
  3. once (sth happens, then...)
  4. when
  5. in a short time
  6. in one day
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From the library

今一旦以属曹操，未审是何主见？
三国演义（第四十三回）, p. 3 · C2
今括一旦为将，东向而朝，军吏无敢仰视之者，王所赐金帛，归藏于家，而日视便利田宅可买者买之。
史记·廉颇蔺相如列传, p. 9 · C2
一旦老人生病或行动不便，照顾的责任便落在了一两个子女身上，他们往往分身乏术。
老龄化社会中的家庭照料, p. 1 · C2

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