磨杵成针
mó​chǔ​chéng​zhēn

little strokes fell great oaks

磨杵成针 磨杵成針 mó​chǔ​chéng​zhēn
little strokes fell great oaks
to grind an iron bar down to a needle; used to describe how any difficult task can be accomplished with persistence and steady effort

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Written text
0.002 per million

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Sources
Frequency data
BCC Corpus (BLCU)