我也包括一个 mwe
\documentclass{aims}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\usepackage{txfonts}
\usepackage{mathtools}
\usepackage{amscd}
\def\typeofarticle{article}
\def\currentvolume{7}
\def\currentissue{x}
\def\currentyear{2022}
\def\currentmonth{Received date 27 September 2022, Accepted date }
\def\ppages{xxx--xxx}
\def\Received{}
\def\Revised{}
\def\Accepted{}
\def\Published{}
\numberwithin{equation}{section}
\DeclareMathOperator*{\essinf}{ess\,inf}
\makeatletter
\renewcommand{\@biblabel}[1]{#1\hfill \hspace{-0.2cm}}
\makeatother
\newcommand{\ep}{\varepsilon}
\newcommand{\eps}[1]{{#1}_{\varepsilon}}
\newtheorem{thm}{Theorem}[subsection]
\newtheorem{cor}[thm]{Corollary}
\newtheorem{lem}[thm]{Lemma}
\newtheorem{prop}[thm]{Proposition}
\theoremstyle{definition}
\newtheorem{defn}[thm]{Definition}
\theoremstyle{remark}
\newtheorem{rem}[thm]{Remark}
\numberwithin{equation}{subsection}
\newcommand{\norm}[1]{\left\Vert#1\right\Vert}
\newcommand{\essnorm}[1]{\norm{#1}_{\ess}}
\newcommand{\Lim}[1]{\raisebox{0.5ex}{\scalebox{0.8}{$\displaystyle \lim_{#1}\;$}}}
\DeclareMathOperator{\sign}{sgn}
\begin{document}
\begin{abstract}
blah blah blah blah
\end{abstract}
\end{document}