closed book基本解释
不为人知的人或事；无法解释的事物
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closed book
closed book是什么意思？
不为人知的人或事；无法解释的事物
- 单词
- closed book
closed book 学习重点
- 先确认 closed book 的核心释义，再结合音标完成发音记忆。
- 阅读下方例句、词组和双语内容，可以判断 closed book 在真实语境中的用法。
更新时间：2026-07-09 02:25:01
- 英英释义
Noun:
- something that baffles understanding and cannot be explained;
"how it got out is a mystery"
"it remains one of nature's secrets"
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