动词短语
中文翻译：使某人头疼
同义词：
['worry', 'fret', 'bother']
例句：
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1. Iracked my brains to come upwith an answer for the problem.
我绞尽脑汁想出一个解决这个问题的办法。
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2. Shewas racking her brains to rememberthe names of all the guests.
她正努力回忆所有客人的名字。
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3. Thestress of the exam madehim feel like he was racking his brains.
考试的压力让他感到头昏脑胀。