Taivo A Taiwan Mandarin dictionary

一是一,二是二

yīshìyī,èrshìèr

ㄧ ㄕˋ ㄧ , ㄦˋ ㄕˋ ㄦˋ

  1. 1lit. one is one, two is two (idiom)
  2. 2fig. things are (or ought to be) perfectly clear-cut
  3. 3unequivocal

Keep 一是一,二是二 and it comes back until you know it.

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