金無足赤

jīnwúzúchì

gold can't be hundred percent pure (and man can't be absolutely perfect)

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jin1 wu2 zu2 chi4

not all gold is sufficiently red (idiom); no-one is perfect

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金無足赤|金无足赤 [jīn wú zú chì] ► not all gold is sufficiently red (idiom); no-one is perfect