He had to rack his brains to solve that complicated problem.
他不得不绞尽脑汁去解决那
复杂
。
He had to rack his brains to solve that complicated problem.
他不得不绞尽脑汁去解决那复杂。
She is worrying the problem out.
她正在绞尽脑汁解决这。
：
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