Tā dúshū fēicháng kèkǔ, zhēn kěwèi wéibiān-sānjué.
He studies extremely hard; you could truly say he has worn out his books.
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From 《史记·孔子世家》: in old age Confucius read the 《易经》 so many times that the leather thongs binding its bamboo slips broke three times. 三 here means "many times".