参考词典中closed book的常规释义:
基本释义
- n. 一无所知的东西
已结束的事(计划、行动等)
英英解释
1个名词解释
- something that baffles understanding and cannot be explained
[同] enigma, mystery, secret, closed book
[例]- it remains one of nature's secrets
- how it got out is a mystery
点击查看……- something that baffles understanding and cannot be explained







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