MacOS的行尾以回车字符结束，许多文本处理工具将这样的文件作为一行来处理。
Mac OS ends lines with the carriage return character, and many text processing tools treat such files as a single line. To fix that, we can use the following tricks.
对于文件结尾缺少的行尾标记，不提供特殊的处理。
No special handing for a missing end of line marker at the end of the file is provided.
对于文件结尾缺少的行尾标记，不提供特殊的处理。
No special handing for a missing end of line marker at the end of the file is provided.
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