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。
She bit down on my knuckle, playfully hard.
她在我的指关节上顽皮地狠狠咬了一口。
She bit down on my knuckle, playfully hard.
她在我的指关节上顽皮地狠狠咬了一口。
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