Valvulae vasorum

valvulae

[医] 瓣, 瓣膜

I need to confirm my reservation.

我要确认我的预定。

Who has never tasted bitter, knows not what is sweet.

不尝黄连苦，怎知蜂蜜甜。

Next, if it is not a story, get an idea of the organization of the book. Read the back cover and the introduction. Look at the pictures and the short texts below them. Turn to the front of the book and look at the contents. This way you can decide whether

其次，如果不是故事书，你就要对书的篇章结构有所了解。看看目录。这样，你就可以判断这本书是否可能引起你的兴趣。如果是这样，你就可以断定哪几个部分最有用，最有趣。