If the output stream was stdout, and if it was piped to another process (at the command line level), the selected pages will become the input to that process.

如果输出流是标准输出，并且由管道输送至另一个进程(在命令行级别)，则选定的页将成为该进程的输入。

youdao

The mapping root is the top level input and output pair within the mapping.

映射根就是指映射内的根级别的输入和输出对。

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When we think about the long process of our English study and the level of our mastery of this language that we have reached, we should say that the input and output ratio is too low.

想想我们学习英语的漫漫之路和我们对英语掌握的程度，应该说我们的投入与产出比太低了。

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