Gets a backslash character that can be used in a directory string.
获取可在目录字符串中使用的反斜杠字符。
A backslash can escape a double quote, or any single whitespace character.
后斜杠可以对双引号或任一空白字符进行转义。
Backslash does not act as an escape character.
反斜杠不作为转义字符。
A control symbol consists of a backslash followed by a single, nonalphabetic character.
控制字，控制符号，以及大括号控制信息。
A control symbol consists of a backslash followed by a single, nonalphabetic character.
控制字，控制符号，以及大括号控制信息。
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