历久弥坚

li4 jiu3 mi2 jian1

to become more resolute with the passing of time (idiom)

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历久弥坚

lì jiǔ mí jiān

remain unshakable and become even firmer as time goes by

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歷久彌堅|历久弥坚 [lì jiǔ mí jiān] ► to become more resolute with the passing of time (idiom)