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知己知彼

Source : CEDICT

Know yourself, know your enemy (idiom, from Sunzi's Art of War 孫子兵法|孙子兵法[Sun1 zi3 Bing1 fa3])

Source : CEDICT

Know yourself, know your enemy (idiom, from Sunzi's Art of War 孫子兵法|孙子兵法[Sun1 zi3 Bing1 fa3])