MEANING/意义
      
  • yí dàn
      
    sound for pinyin
      
      
    if; when; in one day; in a short time; in case (sth happens) ; once (sth happens, then...) 
    Type adverb/副词; noun/名词  
        
EXAMPLES/列句
  •   
      
    yí dàn shī liàn ,quē diǎn yì jiàn .
      
    sound for pinyin
    Where love fails, we espy all faults.

  •   
      
    qiān qiū wěi yè huǐ yú yí dàn
      
    sound for pinyin
    A thousand years' great achievements were destroyed in one day.
COMBINATIONS/组合
  •   
    yí dàn kāi dǎ
      
    sound for pinyin
    once the war starts
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