在下面的例子中，subsequently前两种情况以及第四种情况中都使用连字符，但第三种情况中没有使用连字符。
\documentclass{article}
\usepackage{fontspec}
\begin{document}
\begin{itemize}
\item \texttt{Lorem ipsum dolor sit amet, consectetur adipiscing} elit subsequently.
\item \texttt{\lefthyphenmin=62 Lorem ipsum dolor sit amet, consectetur adipiscing} elit subsequently.
\item {\ttfamily\lefthyphenmin=62 Lorem ipsum dolor sit amet, consectetur adipiscing} elit subsequently.
\item {\ttfamily Lorem ipsum dolor sit amet, consectetur adipiscing} elit subsequently.
\end{itemize}
\end{document}
第三行有什么不同？\showthe\lefthyphenmin第三行中的使用表明它在分组后已正确恢复为 2 \ttfamily，因此一定是其他东西；但是什么呢？
答案1
不同之处在于设置是水平还是垂直模式，即在段落之前还是段落内，比较下面的第 3 和第 4 个版本。我稍微调整了示例，以便可以使用 pdftex 或 xetex。
\documentclass{article}
\advance\textwidth-15pt
%\usepackage{fontspec}
\begin{document}
\begin{itemize}
\item \texttt{Lorem ipsum dolor sit amet, consectetur adipiscing} elit subsequently.
\item \texttt{\lefthyphenmin=62 Lorem ipsum dolor sit amet, consectetur adipiscing} elit subsequently.
\item {\ttfamily\lefthyphenmin=62 Lorem ipsum dolor sit amet, consectetur adipiscing} elit subsequently.
\item \leavevmode{\ttfamily\lefthyphenmin=62 Lorem ipsum dolor sit amet, consectetur adipiscing} elit subsequently.
\item {\ttfamily Lorem ipsum dolor sit amet, consectetur adipiscing} elit subsequently.
\end{itemize}
\end{document}