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