a closed book
常见例句
- Fishing is a closed book to me.
我对钓鱼是一窍不通。 - The actress' life is a closed book to us.
那个女演员的生活对我们来说是个秘密。 - Paul Newman officially announced his retirement from acting in 2007 - "It's pretty much a closed book for me, " he said.
2007年，保罗纽曼正式宣布息影——“对我来说，这本书已经合上了”，他说。 - And other classes are completely closed book. You can't bring anything into it, even a calculator, so.
而有些课的考试是完全闭卷考试。考试时什么都不能带，甚至计算器都不行。
考试应该这么准备 - SpeakingMax英语口语达人 - Who can possibly remain a closed book, when others try to open it and leaf through?
NEWYORKER: Hack Work - But diplomats and other foreign observers admit that the army is a closed book to outsiders.
ECONOMIST: By-elections in Myanmar - This election may have closed the book on a Vietnam veteran ever being elected president.
FORBES: Magazine Article 返回 a closed book