environment pointer pair [计] 环境指示字对
The environment pointer is not used in most languages.
环境指针在大多数语言中并未使用。
The third field is an environment pointer for languages that use one, but is normally just set to zero.
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。
Some garbage collection algorithms require significant cooperation from the compiler or runtime environment, such as updating reference counts whenever a pointer assignment is performed.
一些垃圾收集算法要求编译器或者运行时环境的重要配合，如当进行指针分配时更新引用计数。
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