A key benefit of an MMU is memory protection: an OS can use it to protect against errant programs, by disallowing access to memory that a particular program should not have access to.

• 使用MMU的一个重要好处就是“内存保护”：OS通过禁止没有访问权限的程序读取某些存储区域，来减少不良程序带来的错误。