to study diligently 刻苦钻研 ; 磨杵成针 ; 磨穿铁砚
I need to study diligently 我需要努力读书
Study Diligently And Train Hard 勤学苦练
Study Diligently And Unremittingly 磨穿铁砚
Study Diligently In Bad Conditions 萤窗雪案
Diligently study 勤勉地读书
I can study Korean diligently 我可以努力学习韩语
I study most diligently 我学习最努力
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