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。
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。
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。
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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