当你写程序时，你会发现在同一个程序中会多次用到同一个常量。
As you write your programs, you will find that you will often use the same constant many times in the same program.
但是不同的应用程序或同一应用程序的不同实例可以放在不同的内存窗中，并消耗系统上更多的可用物理内存。
But different applications, or distinct instances of a single application, can be placed in different memory Windows and consume more of the available physical memory on the system.
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