On the other hand, message buffering can be expensive, as it entails additional memory-to-memory copying, and it requires the allocation of memory for buffering.

另一方面，消息缓冲可能是代价高昂的，因为它需要额外的“内存到内存”的拷贝操作，同时它还需要申请用于缓冲的存储区。

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The PowerPC uses a load/store (also called RISC) instruction set, which means that the only time it accesses main memory is for loading into registers or copying a register to memory.

PowerPC 使用了加载/存储（也成为 RISC）指令集，这意味着访问主存的惟一 时机就是将内存加载到寄存器或将寄存器中的内容复制到内存中时。

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As it discovers each unreachable object, it USES a memory-copying function to compact the reachable objects in memory, freeing up the blocks of address Spaces allocated to unreachable objects.

每找到一个无法取得的物件时，它便会使用记忆体复制功能，压缩记忆体中可取得的物件，然后释放出为无法取得的物件所配置的位址空间区块。

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