在1991年，跨架构的操作系统可移植性不是大多数程序员都能体验的一件事。
Operating system portability across architectures was not something that most programmers had much experience with in 1991.
另外，“系统服务”在应用程序开发语言中的出现使可移植性变得更为容易，因为操作系统从视野中消失。
Among other things, exposure in an application development language of a "system service" makes portability easier, for the operating system simply vanishes from view.
可移植性和良好的设计通常是密不可分的，从而使得这些决策的好处在整个操作系统中显而易见。
Portability and good design often go hand in hand, making the benefits of these decisions evident throughout the operating system.
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