第4段到第7段(0x3到0x6)为进程堆保留。

Segments four through seven (0x3 to 0x6) are reserved by the process heap.

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在默认情况下，malloc子系统把整个进程堆当作单一实体。

By default, the malloc subsystem treats the entire process heap as a single entity.

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第三种形式适用于进程堆小于256 MB的程序(见图5)。

The third form is for programs that have a process heap less than 256 MB (see figure 5). In this form.

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