这一过程还解释了怎样将一个或者几个更小的组件合并起来，还说明了怎样根据你的需要定制大型的包，如图1所示。
The process addresses how to incorporate one or several smaller components, as well as how to customize large packages to your needs, as shown in Figure 1.
如果文件系统的可用空间较少，那么通常将在后台执行这一过程(或者根据需要执行)。
This process is commonly done in the background or as needed, if the file system is low on available space.
根据治疗程度的不同，这一过程通常会耗费两三个小时不等。
The process typically takes a couple of hours, depending on the extent of treatment.
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