Constant grinding can turn an iron rod into a needle ; Constant dropping wears away a stone. ; if you work at it hard enough, you can grind an iron rod into a needle -- perseverance spells success. ; Little strokes fell great oaks. ; With time and patience the leaf of the mulberry becomes satin.
只要功夫深,铁杵磨成针 "Constant grinding turns an iron rod into a needle."
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