事理 (shì lǐ) — (noun) reason, logic, the principles or proper way of doing things

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예문

• 处理这种复杂问题，首先要弄清事理。
  Chǔ lǐ zhè zhǒng fù zá wèn tí, shǒu xiān yào nòng qīng shì lǐ.
  To handle this kind of complex problem, you first need to figure out the underlying logic.
• 他做事不讲事理，只顾自己的利益。
  Tā zuò shì bù jiǎng shì lǐ, zhǐ gù zì jǐ de lì yì.
  He doesn't follow reason in doing things; he only cares about his own interests.
• 这本书讲的是商业事理，对创业者很有帮助。
  Zhè běn shū jiǎng de shì shāng yè shì lǐ, duì chuàng yè zhě hěn yǒu bāng zhù.
  This book talks about business principles, which is very helpful for entrepreneurs.