The functions of the MMU are to control the various memory systems, translate the virtual addresses into physical addresses and control the access permission.

MMU的功能是控制各种存储系统的工作并将虚地址转换成物理地址，以及控制存储器访问权限。

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By use of besic functions of LIM expanded memory specifications, the paper gives constructed method of a real virtual array of expanded memory and its application in large scientific computations.

给出建立扩充内存的实型拟数虚拟数组的方法及其若干操作，指出它们在大型科学计算中的应用。

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The only significant cost of virtual functions is one additional memory lookup before a virtual function can be called.

虚拟函数唯一一个明显的代价是在 调用虚拟函数之前附加了一个存储查询。

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