The connection section of the output shows whether the connection of successful or not.
输出的连接部分显示连接是否成功。
Without output devices computer users would not be able to view or use their work.
没有输出装置，计算机用户就无法看到或使用他们的成果。
The output option was not specified or the file could not be written.
未指定输出选项或未能写入文件。
The output option was not specified or the file could not be written.
未指定输出选项或未能写入文件。
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