an open book 昭然若揭的事 ; 众所周知的事 ; 毫无秘密的事
I'm an open book instead 然而我已覆水难收
An open-book exam 开卷考试
be an open book 率直的人
i'm an open book 我知无不言
talk like an open book 毫不隐瞒地讲话
to be an open book 意指一目了然的事
an open book exam 开卷考试
Hold an open book in your hands in front of you and close it quickly. What can you feel?
手中拿一本展开的书放在面前，快速合上书，你能感觉到什么？
It's evolved since then into a social network: an open book on its members' lives, welcoming just about anyone.
后来它进化到一个社交网络：一本关于它的成员的敞开的书，欢迎任何人来阅读。
One of the misfortunes which always pursues the unbusinesslike is that, while they are as easy to read as an open book, they never learn to read the character of others.
不善经营的人常有这样的一种不幸：他们自己像一本打开的书那样，容别人看个仔细，但自己却从不去学习怎样看懂别人。
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