Doing so provides a layer of abstraction around the cached file.

这样可为缓存后的文件提供一个抽象层。

youdao

At first, each higher layer of abstraction was introduced only as a concept.

最初，每一个更高层次的抽象只是作为一个概念被引入。

youdao

By using this layer of abstraction, consuming applications can easily swap out the dictionary provider they use.

通过这个抽象层，消费应用程序很容易切换使用的词典提供程序。

youdao

The TAL provides a layer of abstraction that takes care of any difference in devices capabilities or controls, so that software built using it will continue to run on anything added to the BBC's certified list without the need for a new version.

ENGADGET