closed book是什么意思 closed book在线翻译 closed book什么意思 closed book的意思 closed book的翻译 closed book的解释 closed book的发音
closed book英 [kləʊzd buk] 美 [klozd bʊk]
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closed book 英英释义
noun
1. something that baffles understanding and cannot be explained
e.g. how it got out is a mystery
it remains one of nature''s secrets
Synonym: mysteryenigmasecret
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