a closed book
不为人们所知的事, 秘密
The actress'life a closed book to us.
那个女演员得生活对我们来说是个秘密。
For many people the Bible is a closed book.
大多数人对《圣经》一无所知。
I'm afraid accountancy is a closed book to me.
我恐怕对会计学一窍不通。
To an unsaved person, the Bible is a closed, difficult book.
对未得救的人而言，圣经是一部难明的典籍。
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