\documentclass{article}
\usepackage[UTF8]{ctex}
\title{This is a scientific paper}
\author{meta}
\date{}
\begin{document}
\maketitle{}
\section{Introduction}
\paragragh{haha}
233333
\end{document}
显示错误:Undefined control sequence. [\paragragh]
似乎是没有\paragraph指令?有点不可思议