I'm going to have to knuckle down to some serious study.

我得开始认认真真地学习了。

《牛津词典》

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。

youdao

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。

youdao