原因可能是行间空白通常都包括下行线；而因为大部分字符都没有下行线，那么多余的空白就出现在了线的下面了。
The reason may be that leading usually includes the space taken up by descenders; and because most characters do not have descenders, additional white space is created under the line.
原因可能是行间空白通常都包括下行线；而因为大部分字符都没有下行线，那么多余的空白就出现在了线的下面了。
The reason may be that leading usually includes the space taken up by descenders; and because most characters do not have descenders, additional white space is created under the line.
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