在 32 位机器上页表通常只可以存储在低端内存中。

Page-tables can normally be stored only in low memory on 32-bit machines.

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这些内存必须使用低端内存，而这在32位硬件上有点不够用。

This memory must also come from low memory, which on 32-bit hardware is somewhat limited.

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在应用程序使用了大量进程并映射了大量内存的情况下，低端内存可能很快就不够用了。

In a situation where applications use a large number of processes and map a lot of memory, low memory can quickly become scarce.

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