知己知彼百战不殆 Know yourself
知己知彼 百战不殆
Know yourself and know your enemy
以上为机器翻译结果，长、整句建议使用 人工翻译 。
中国有一名话：“知己知彼，百战不殆。”意思说，打仗的时候，既要了解自己，还要了解自己的对手，这样才能在每场战役中取胜。
As the Chinese saying goes, "know the enemy and know yourself, and you can fight a hundred battles with no danger of defeat", one should know both himself and his counterpart to win each battle.
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