在内部，发出sys_read(或等效内容)以从文件中读取数据。

Internally a sys_read (or equivalent) is issued to read the data from the file.

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说明如何从文本文件中读取数据。

Demonstrates how to read from a text file.

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说明如何从文本文件中读取数据。

Demonstrates how to read from a text file.

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