There are two kinds of abstraction layers: a hardware one, and its necessity is obvious, then there is a platform abstraction layer to make use of the best features a platform provides.
有两种抽象层：硬件抽象层及平台抽象层，前者的必要性显而易见，而后者的目的是充分利用平台所提供的最佳特性。
Eclipse contains a platform GUI abstraction layer and an accessibility API that is typically mapped to native operating system platform frameworks.
Eclipse包括一个平台GUI抽象层和一个映射到本地操作系统平台框架的易访问性api。
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