Taivo A Taiwan Mandarin dictionary

事倍功半

shìbèigōngbàn

ㄕˋ ㄅㄟˋ ㄍㄨㄥ ㄅㄢˋ

  1. 1(idiom) to expend twice the effort for half the result

Keep 事倍功半 and it comes back until you know it.

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