环境指针在大多数语言中并未使用。
由应用程序和环境指针指定的区域的内容实际上是用户定义的。
The contents of the areas pointed to by application and environment Pointers are actually user-defined.
第三个域是语言的一个环境指针(如果该语言使用了环境指针的话),不过通常都会被设置为0。
The third field is an environment pointer for languages that use one, but is normally just set to zero.
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