非打印字符：某个特殊字符，如制表符或者段落截止符，通常隐藏不能被打印但可显示出来。
A special character, for example tabstop or paragraph break that is normally hidden and cannot be printed, but which can optionally be displayed.
隐藏字符也计算在内，即使它们不显示。
Hidden characters are counted even if they are not displayed.
隐藏字符也计算在内，即使它们不显示。
Hidden characters are counted even if they are not displayed.
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