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Jyutping zi1 bei2
Pinyin zhī bǐ

Definitions (Wiktionary)
  1. verb, literary
    to know one's enemy
    • 有一種人,明於知己,暗於知彼,又有一種人,明於知彼,暗於知己,他們都是不能解決戰爭規律的學習和使用的問題的。
      有一种人,明于知己,暗于知彼,又有一种人,明于知彼,暗于知己,他们都是不能解决战争规律的学习和使用的问题的。
      yǒu yī zhǒng rén , míng yú zhī jǐ , àn yú zhī bǐ , yòu yǒu yī zhǒng rén , míng yú zhī bǐ , àn yú zhī jǐ , tā men dōu shì bù néng jiě jué zhàn zhēng guī lǜ de xué xí hé shǐ yòng de wèn tí de .
      Some people are good at knowing themselves and poor at knowing their enemy, and some are the other way round, neither can solve the problem of learning and applying the laws 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.
  2. Mandarin
    有一种人,明于知己,暗于知彼,又有一种人,明于知彼,暗于知己,他们都是不能解决战争规律的学习和使用的问题的。
    有一種人,明於知己,暗於知彼,又有一種人,明於知彼,暗於知己,他們都是不能解決戰爭規律的學習和使用的問題的。
    yǒu yī zhǒng rén , míng yú zhī jǐ , àn yú zhī bǐ , yòu yǒu yī zhǒng rén , míng yú zhī bǐ , àn yú zhī jǐ , tā men dōu shì bù néng jiě jué zhàn zhēng guī lǜ de xué xí hé shǐ yòng de wèn tí de .
    • Some people are good at knowing themselves and poor at knowing their enemy, and some are the other way round, neither can solve the problem of learning and applying the laws of war.