I'm going to have to knuckle down to some serious study.
我得开始认认真真地学习了。
He would not knuckle down under their pressure.
他不会在他们的压力下屈服的。
You 'll really have to knuckle down if you want to pass the examination.
如果想通过考试，你确实应专心学习。
There's a start, a finish, and the faster you run, the further you go: the secret to winning a marathon is to knuckle down and keep going.
有起点，也有终点，你跑得越快，也就跑得越远：马拉松比赛获胜的秘诀是沉下气来，一直往前跑。
He managed to knuckle down to his lessons long enough to pass his examination.
他在离考试还有足够长时间的时候就开始认真学习，从而通过了考试。
He managed to knuckle down to his lessons long enough to pass his examination.
他在离考试还有足够长时间的时候就开始认真学习，从而通过了考试。
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