短形式字符串应该包含每个有效的选项字母，每个字母后面是一个冒号 (:)，这表示命令行选项后面应该是一个值。
The short form string should include each valid option letter, followed by a colon (:) to indicate that the command line option should be followed by a value.
长形式命令行选项采用相似但略有差异的格式。
Long form command line options have a similar yet slightly different format.
如果有效命令行（长形式）选项标识符的数量不大，这种方式很合适。
This approach is fine provided the number of valid command line (long form) identifiers is small.
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