Taivo A Taiwan Mandarin dictionary

可一而不可再

kěyīérbùkězài

ㄎㄜˇ ㄧ ㄦˊ ㄅㄨˋ ㄎㄜˇ ㄗㄞˋ

  1. 1may be done once and once only; just this once

Keep 可一而不可再 and it comes back until you know it.

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