This can be restated as follows: the program should operate the same, irrespective of its source of input (a file, a pipe, or the terminal) and of its output destination.

该特性可以重新叙述如下：不管程序的输入源(文件、管道或终端)和输出目的地是什么，程序都应该以同样的方式工作。

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Import the program source (for example, a COBOL copybook) and generate metadata describing the input and output of the program.

导入程序源文件(例如，COBOL copybook)并生成描述程序输入和输出的元数据。

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If input from one source becomes available, it will be processed, and the program will then wait for new input.

如果其中一个信号源出现，程序就会进行相应处理，同时程序会继续等待新的输入。

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