The business data information is maintained and manipulated intact in both the application and database layers, and as you will see in Part 3, even in the client layer.

在应用程序层和数据库层中都按原样维护和操作业务数据信息，而且您将第3部分中看到，甚至在客户机层中也是如此。

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The Data Abstract Layer consists of a single class to provide location-related data to the business layer (see Figure 3).

数据抽象层包含一个类，用于向业务层提供关于位置的信息（请参见图 3）。

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Listing 3 shows XML fragment for a database tier with two server groups.

清单3给出包含两个服务器组的数据库层的xml片段。

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So, from going from the shell of n equals 2, let's say, to the shell of n equals 3.

比如说，从ｎ等于２到ｎ,等于３壳层如何变化。

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Where, you know, you might have a single family that is using up 2 or 3 stories of the same apartment.

一个家庭也许会用上同一幢公寓的二三层楼。

上东区的房子 - SpeakingMax英语口语达人

One, two, three, four, so on each level of the picture I'm drawing, I've seem only to be looking at each number once.

，2，3，4，可见，在我画的,这幅图的每一层上，对每个数字,都只会用到一次。

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