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前事不忘,后事之师

qián shì bù wàng , hòu shì zhī shī

9-character word Traditional 前事不忘,後事之師

What 前事不忘,后事之师 means

  1. don't forget past events, they can guide you in future (idiom); benefit from past experience

The characters in 前事不忘,后事之师

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