知己知彼

zhī jǐ zhī bǐ

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定義

1. know yourself, know your enemy (idiom, from Sunzi's \The Art of War\ 孫子兵法|孙子兵法[sūn zǐ bīng fǎ])

know yourself and know your enemy, and you will never be defeated (idiom, from Sunzi's \The Art of War\ 孫子兵法|孙子兵法[sūn zǐ bīng fǎ])

to know oneself

self

that

to know