理 has 𤣩 jade as the meaning part and 里 lǐ as the sound part. It first meant 'to process jade'. That grew to 'carve jade', 'line, pattern', 'reason, science', and 'to manage'.
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Example Sentences
我们需要找到解决这个问题的理由。
wǒmenxūyàozhǎodàojiějuézhègèwèntídelǐyóu 。
We need to find a reason to solve this problem.
她说的话很有道理。
tāshuōdehuàhěnyǒudàolǐ 。
What she said makes a lot of sense.
经理负责管理公司的事务。
jīnglǐfùzéguǎnlǐgōngsīdeshìwù 。
The manager is responsible for managing the company's affairs.