前車之鑒

qiánchēzhījiàn

warning taken from the overturned cart ahead; lessons drawn from others' mistakes

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qian2 che1 zhi1 jian4

to learn a lesson from the mistakes of one's predecessor (idiom)

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前車之鑒|前车之鉴 [qián chē zhī jiàn] ► to learn a lesson from the mistakes of one's predecessor (idiom)