动词短语
中文翻译：集中精力
同义词：
['settle down', 'focus on', 'concentrate']
例句：
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1.She knuckled down to the task with determination.
她以决心全力以赴地完成了这项任务。
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2. The team knuckled down to work on the project until it was done.
团队齐心协力，直到项目完成。
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3.After a long day of studying, she knuckled down to reviewing her notes.
经过长时间的学习后，她决定复习笔记。