In particular, what if we decided we wanted to write a program that would test what happens when we run a program on itself as input.

特别是，如果把一个程序自身当作它的输入是会发生什么，我们需要编写一个怎忙的程序来测试它呢？

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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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Write and test a big program in small pieces.

将一个大块的程序分解成几个小部分进行编写和测试。

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