前事不忘，後事之師 [ㄑㄧㄢˊ ㄕˋ ㄅㄨˋ ㄨㄤˋ , ㄏㄡˋ ㄕˋ ㄓ ㄕ; qian2 shi4 bu4 wang4 , hou4 shi4 zhi1 shi1] don't forget past events, they can guide you in future (idiom); benefit from past experience ◄ ►
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