\documentclass{article}
\begin{document}
\noindent\hrulefill% only demo
\begin{center}
\begin{tabular}{l}
E: Test text.\\
F: Line 2 of test text.
\end{tabular}
\end{center}
\end{document}
答案2
以下是一个猜测答案:
\documentclass{article}
\usepackage{pbox}
\usepackage{lipsum}
\begin{document}
\lipsum[2]
\begin{center}
\pbox{\linewidth}{E: Test text.\\F: Line 2 of test text.}
\end{center}
\end{document}
输出:
答案3
使用\shortstack:
\documentclass{article}
\begin{document}
\noindent\hrulefill% only demo
\begin{center}
\shortstack[l]{E: Test text.\\F: Line 2 of test text.}
\end{center}
\end{document}