每个分区本身就像一台机器：它有自己的处理器、内存等等。
Each partition is like it's own machine: it has its own processors, memory, and so on.
你需要选择虚拟机器的容量——CPU、内存等等——以便提供出色的性能。
You'll need to choose the size of your virtual machines-in terms of CPU, memory, and so on-in order to deliver good performance.
由于这些进程已经存在，因此操作系统不需要浪费宝贵的时间来创建进程、为之分配内存等等。
Since these processes already exist, there's no need for the operating system to waste valuable time to create a process, allocate memory to it, and so on.
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