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knuckle down

原文解釋: to get buy doing something, or to suddenly start working or studying hard

中文解釋: 認真工作(認真做某件事)


已下為三個例句: 

1. We all knuckled down to study just before final exams.

2. You will really have to knuckle down if you want to pass the examination.

3. It's time to knuckle down to work.

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