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Jyutping zi1 bei2 zi1 gei2 , baak3 zin3 bat1 toi5
Pinyin zhī bǐ zhī jǐ , bǎi zhàn bù dài

Definitions (Wiktionary)
  1. phrase, idiomatic
    Know the enemy and know yourself, and you can fight a hundred battles with no danger of defeat.
    (syn.) 百戰不殆, 百战不殆, 知己知彼

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Jyutping zi1 bei2 zi1 gei2 , baak3 zin3 bat1 toi5
Pinyin zhī bǐ zhī jǐ , bǎi zhàn bù dài

Definitions (CC-CEDICT)
  1. knowing the enemy and yourself will get you unscathed through a hundred battles (idiom, from Sunzi's "The Art of War")
Examples (Wiktionary)
  1. Mandarin
    但战争不是神物,仍是世间的一种必然运动,因此,孙子的规律,“知彼知己,百战不殆”,仍是科学的真理。
    但戰爭不是神物,仍是世間的一種必然運動,因此,孫子的規律,“知彼知己,百戰不殆”,仍是科學的真理。
    dàn zhàn zhēng bù shì shén wù , réng shì shì jiān de yī zhǒng bì rán yùn dòng , yīn cǐ , sūn zǐ de guī lǜ , “ zhī bǐ zhī jǐ , bǎi zhàn bù dài ” , réng shì kē xué de zhēn lǐ .
    • Yet war is in no way supernatural, but a mundane process governed by necessity. That is why Sun Wu Tzu's axiom, "Know the enemy and know yourself, and you can fight a hundred battles with no danger of defeat", remains a scientific truth.