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.
正如清单3中所阐述的，多余的字符要么换行要么截断。
As illustrated in Listing 3, the additional characters can either be wrapped or truncated.
这非常方便，因为你不用在手动的移除多余的斜线以免只是合并两个字符串。
This is handy because you don't have to manually remove the extra slashes that might result in just combining the two strings.
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