a closed book meaning in English
谜, 未揭开的秘密 高深莫测的事物
指我们不懂的地方，例如
Examples
- The man's early life is a closed book .
那人的早年生活是个不可告人的谜。 - Nuclear physics is a closed book to most of us .
我们大多数人对原子核物理学一窍不通。 - For me , geology is a closed book
对我来说地质学是一门我完全不懂的学科。 - Nuclear physics is a closed book to me
核物理学是我完全不懂的一门学科。 - A closed book
未揭开的秘密