Taivo A Taiwan Mandarin dictionary

乘虛而入

chéngxūérrù

ㄔㄥˊ ㄒㄩ ㄦˊ ㄖㄨˋ

Simplified 乘虚而入

  1. 1to enter by exploiting a weak spot (idiom); to take advantage of a lapse

Keep 乘虛而入 and it comes back until you know it.

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