For example, it is difficult to test whether a program is making proper use of the filesystem without actually allowing it to read and write from the filesystem.

例如，实际上如果不允许一个程序从文件系统进行读和写，很难测试它是否正确使用了该文件系统。

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Their project was to build an object bench for Eclipse that lets you interact with objects of classes you create, without having to write a complete program.

他们的工程是为eclipse建立一个对象平台，可以使您与您创建的类对象交互，且不必书写完整的程序。

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For this reason, GDI was constructed so that you can write a program without worrying much about color-that is, Windows can convert colors to gray shades.

由于这个原因，GDI被构建成以便你可以不用更多考虑颜色就编写程序——也就是说，Windows可以将颜色转换为灰白色图案。

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