空间引用系统的第二部分是投影，它定义了如何将地球表面放置在2 - d平面上。
The second part of a spatial reference system is its projection, which defines how to lay out the Earth surface onto a 2-d surface.
主交换空间是通常在启动时配置的交换空间，并且通常是作为操作系统安装的一部分来设置的。
The primary swap space is that of which is normally configured during boot time and usually set up as part of the installation of your operating system.
椭圆体模型是空间引用系统定义的第一部分。
The ellipsoid model is the first part of a spatial reference system definition.
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