Taivo A Taiwan Mandarin dictionary

空室清野

kōngshìqīngyě

ㄎㄨㄥ ㄕˋ ㄑㄧㄥ ㄧㄝˇ

  1. 1empty room, clean field (idiom); clean out everything to leave nothing for the enemy
  2. 2scorched earth policy

Keep 空室清野 and it comes back until you know it.

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