这个系统内存 256 兆字节，可扩充到 2 千兆字节。
扩充的额外内存会有很大的不同——如果你曾经给Mac机添加过内存，那你应该知道这对提升Mac OS X系统的效率是多么有效。
The added RAM alone probably makes a huge difference — if you have ever added memory to a Mac you’ll know how much OS X loves it some extra gigs to play around in.
使系统中所有的卷被作为一个单独的实体，而非作为对主内存的扩充。
Where by all volumes are mounted as unique entities in the main fling system, rather than being seen to augment main memory.
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