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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。

If you don't need or use this extra contingency fund then it will not be added to your mortgage upon completion of your new home.

如果你不需要使用这笔额外的应急基金的话，将不会续房贷完成你的新家园。

If the control character itself appears in the file then one extra character is coded.

如果控制字符本身似乎然后在该文件中的一个额外的字符编码。

I've an extra gas cooker on my hands. Do you want to take it off me?

我有一个多余的煤气灶具，你想要拿去吗？

In that case you may have to add extra cooling capacity.

这样的话你可以增强额外的散热能力。

This is an extra copy to have on file.

这是额外备份你知道的以防万一

I would also recommend using a drip loop on all of the power cords to be extra cautious.

我也建议您使用滴灌环路上所有的电源线要特别小心。

Then he took on Cornel West, a black professor, over his dodgy extra-curricular activities.

而后，他又攻击黑人教授Cornel West的"伪"课外活动（Mr Summers又下一城）。

The patterns are unlabeled and, therefore, there is no explicit correspondence between cluster labels in different partitions of an ensemble. An extra complexity arises when different partitions contain different numbers of clusters, often resulting in a label correspondence problem.

一方面，聚类的模式是未标记的，由不同聚类算法得到的标记之间无明显的联系；另一方面，各种划分可能含有不同的聚类个数，这就涉及到标记对应问题。

Crisp Cos Lettuce , freshly grated parmesan , grilled bacon and soft boiled egg with extra virgin olive oil anchovy dressing , basil crusted crouton and your choice of topping Grilled chicken Marinated prawns Fresh grilled salmon

脆生菜，新鲜的碎意大利干酪，培根，水煮蛋，淋上特技初榨橄榄油酱和凤尾鱼，罗勒皮，烤鸡肉，虾肉和新鲜的烤鲑鱼

In the chapter 2, the theoretic knowledge about the photosensitive resin and the grinding tools was firstly introduced.

第二章阐述了光固化树脂结合剂磨具的相关理论研究。

Do not use the program's indenting or margin-setting features; these will be added during typesetting.

不要使用缩排，页面边缘设置之类的选项，偶看不大懂。