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the indentation width is the number of spaces which is used to indent a line. if the option insert spaces instead of tabulators in the section editing is disabled, a tab character is inserted if the indentation is divisible by the tab width.
缩进宽度就是在缩进一行时使用的空格数量。 如果在 编辑 一节中 插入空格替代制表符 选项被禁止, 如果缩进可以被制表符宽度除尽, 就会插入一个 制表符 。