我怎样才能拆分方程式或以某种方式使其完全可见？（WileyNJD-v2.cls）你可以从下载 wiley 格式https://onlinelibrary.wiley.com/pb-assets/assets/14678640/AMA-stix_New-1660139693240.zip
\documentclass[APA,STIX1COL]{WileyNJD-v2}
\usepackage[para,flushleft]{threeparttable}
\usepackage{tikz}
\articletype{research article}%
\received{26 April 2016}
\revised{6 June 2016}
\accepted{6 June 2016}
\raggedbottom
\setlength{\columnsep}{15pt} % set columns separation <<<<<<<<<<<<<<<<<
\begin{document}
\title{Chained masteel fSFRC) beams}
\abstract[Abstract]{Due to the benefits of steel fiber reiDue to the benefits of steel fiber reinforceement atDue to the benefits of steel fiber reinforceement atDue to the benefits of steel fiber reinforceement atDue to the benefits of steel fiber reinforceement atDue to the benefits of steel fiber reinforceement atDue to the benefits of steel fiber reinforceement atDue to the benefits of steel fiber reinforceement atDue to the benefits of steel fiber reinforceement atDue to the benefits of steel fiber reinforceement atDue to the benefits of steel fiber reinforceement atDue to the benefits of steel fiber reinforceement atDue to the benefits of steel fiber reinforceement atDue to the benefits of steel fiber reinforceement atDue to the benefits of steel fiber reinforceement atDue to the benefits of steel fiber reinforceement atDue to the benefits of steel fiber reinforceement atDue to the benefits of steel fiber reinforceement atDue to the benefits of steel fiber reinforceement atDue to the benefits of steel fiber reinforceement atDue to the benefits of steel fiber reinforceement atnforceement at }
\maketitle
\twocolumn
\section{Introduction}\label{sec1}
Significant efforts have been undertaken in recent years to increase the strength and ductility of concretsdggggggggggggggggggg erformance fiber-reinforced concrete (UHPFRC) structures possess exceptional ductility and stren in recent years to increase the strength and ductility of concretsdggggggggggggggggggg erformance fiber-reinfn in recent years to increase the strength and ductility of concretsdggggggggggggggggggg erformance fiber-reinfn in recent years to increase the strength and ductility of concretsdggggggggggggggggggg erformance fiber-reinf
\begin{equation}
\varphi_{k}(val)=\sum s\subseteq\left\{ x_{i},...,x_{n.}\right\} /\left\{x_{k}\right\} \frac{\mid s\mid!(n-\mid s\mid-1)!}{n!}\left(val\left(s\cup\left\{x_{k}\right\} -val(s)\right)\right)
\end{equation}
\end{document}
答案1
以下解决方案使用multline由包提供的环境，amsmath而包又由文档类自动加载WileyNJD-v2。请注意，我不得不猜测/（除法，对吧？）符号的范围；我已将其更改/为\Big/并在第二行的材料周围放置了高括号。如果我的猜测不正确，请告知。
我还删除了所有\left和的实例\right——它们除了弄乱水平间距外什么也不做——并且用 替换了 的两个\mid s\mid实例|s|。
\documentclass[STIX1COL]{WileyNJD-v2}
\usepackage[para,flushleft]{threeparttable}
\usepackage{tikz}
\articletype{research article}
\received{26 April 2016}
\revised{6 June 2016}
\accepted{6 June 2016}
\raggedbottom
\setlength{\columnsep}{15pt}
%% new:
\usepackage{lipsum} % filler text
\newcommand\val{\mathrm{val}}
\begin{document}
\twocolumn
\section{Introduction}\label{sec1}
\lipsum[1][1-4] % filler text
\begin{multline}
\varphi_{k}(\val)
=\sum s\subseteq\{ x_{i},\dots,x_{n} \} \Big/ \\
\Bigl(\{x_{k}\} \frac{|s|!\,(n-|s|-1)!}{n!}
\bigl(\val(s\cup\{x_{k}\} -\val(s))\bigr) \Bigr)
\end{multline}
\lipsum[1][5-8] % more filler text
\end{document}