That's why there's a lot of emphasis on sharpening your teeth by doing this class of problems.

这就是为什么强调要通过解决这些问题,来提高你的能力

耶鲁公开课 - 基础物理课程节选

My advice for improving your writing really has to do with... doing as much reading as you can.

我对于提高你写作能力的建议就是尽可能多阅读。

英语阅读：技巧 - SpeakingMax英语口语达人

And then you'll find that your level of competency increases, your confidence level improves,

到时候你会发现你的能力提高了，信心增强了，

学第二外语的时候 - SpeakingMax英语口语达人