文本超出列

Question

文本超出了列，我该如何修复？我需要它flalign，我们最好不要把它拿出来。

\documentclass{article}
\usepackage[paperwidth=19.0cm,paperheight=27.5cm,margin=1.5cm]{geometry}
\usepackage{amsmath}
\usepackage{multicol,enumitem}
\setlength{\columnseprule}{1.7pt}
\setlength{\columnsep}{1.2cm}
\begin{document}

\begin{multicols*}{2}

\begin{enumerate}[left=0pt,label=\bfseries\arabic*.,ref=\arabic*]
\item No problem here. Text does not exceed the column.
\begin{flalign*}
    &x^2+y^2 \text{But here the text exceeds the column. How can I solve the problem here?}& 
\end{flalign*}
\end{enumerate}

\end{multicols*}
\end{document}

Answer 1

\text本质上\mbox不允许换行。通常最好避免在数学中放置段落级文本，但如果必须，您可以使用\parbox

\documentclass{article}
\usepackage[paperwidth=19.0cm,paperheight=27.5cm,margin=1.5cm]{geometry}
\usepackage{amsmath}
\usepackage{multicol,enumitem}
\setlength{\columnseprule}{1.7pt}
\setlength{\columnsep}{1.2cm}
\begin{document}

\begin{multicols*}{2}

\begin{enumerate}[left=0pt,label=\bfseries\arabic*.,ref=\arabic*]
\item No problem here. Text does not exceed the column.
\begin{flalign*}
    &x^2+y^2 \quad \parbox[t]{4cm}{But here the text exceeds the column. How can I solve the problem here?}& 
\end{flalign*}
\end{enumerate}

\end{multicols*}
\end{document}

flalign*在这个小例子中肯定被误用了，但也许你的真实文档在有意义的地方有一些对齐。

Answer 2

使用 tabularx 可以达到同样的效果。

\documentclass{article}
\usepackage[paperwidth=19.0cm,paperheight=27.5cm,margin=1.5cm]{geometry}
\usepackage{amsmath}
\usepackage{multicol,enumitem}
\setlength{\columnseprule}{1.7pt}
\setlength{\columnsep}{1.2cm}
\usepackage{tabularx}
\begin{document}

\begin{multicols*}{2}

\begin{enumerate}[left=0pt,label=\bfseries\arabic*.,ref=\arabic*]
\item No problem here. Text does not exceed the column.

\begin{tabularx}{\linewidth}{@{}cX@{}}
 $x^2+y^2$ &
But here the text exceeds the column. How can I solve the problem here?
\end{tabularx}
\end{enumerate}

\end{multicols*}
\end{document}