孜孜以求

zi1 zi1 yi3 qiu2

diligent and tireless (idiom)

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孜孜以求

zī zī yǐ qiú

diligently strive after; assiduously seek

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孜孜以求|孜孜以求 [zī zī yǐ qiú] ► diligent and tireless (idiom)