旧书

The old book has come apart and could not be used any more.

这本旧书散开了，没法再看了。

When I asked her what she did with the comic books, she said, I throw them away.

我问她这是做什么，她说：我要把这些没有卖掉的旧书处理掉。

Among these I found a few paper-covered books, the pages of which were curled and damp: The Abbot, by Walter Scott, The Devout Communicant and The Memoirs of Vidocq.

他喜欢翻一些没有人要的旧纸堆，并在里面找到了一些书页已经发黄的旧书。

I.e. the utility of the books are almost the same , so it is a wise choice to choose second hand books. And in the aspect of consumer's surplus, the consumers expect one book to be lower than, say, 30 Yuan, so if he buys the book for 10yuan, he gets extra 20yuan as the so called consumer's surplus.

话说回来，从机会成本的角度来看，因为旧书与新书大部分相差不大，基本不会影响到学生的书籍阅读（即书的效用是几乎一样的），学生在旧书摊买书的机会成本相对较小，于是学生们是会选择到旧书摊买书的。

I have disposed of my old books.

我已处理了我的旧书。

Great portraits. And of old persons, like old dog-eared books, full of hard life which gives sweet heart in the eyes

非常好的人像片，片中的老人，就像边角都已卷起的旧书，虽然刻满生活岁月的艰辛，却在眼中流露出讨人喜欢的欢心。。。。。

It is not necessary to presume the dramatis personae who leaved message in the old book.

而我也不必再去猜这本旧书留言的主人公是谁了。

I closed the book, tears flowed out like spring, and I have no need of guessing the dramatis personae of this old message book.

我合上书，泪水如泉般涌出。而我也不必再去猜这本旧书留言的主人公是谁了。

I unfold the book , tears effuse like the conduit,and I no longer need to guess who is the dramatis personae left word on this old book .

我合上书，泪水如泉般涌出。而我也不必再去猜这本旧书留言的主人公是谁了。

Hellen wouldn't like to throw her old books away.

海伦不愿意把她的旧书扔掉。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。