| 词组 | rack one's brain |
| 释义 | rack one's brainv. phr.To try your best to think; make a great mental effort; especially: to try to remember something you have known. 绞尽脑汁；冥思苦想。◆ Bob racked his brain trying to remember where he left the book.鲍勃绞尽脑汁拼命回想把书放在了哪儿。 |
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