答案1
正如我所评论的,在我看来,你真的只需要一个数字 --- 而不是两个子数字。如果是这种情况,你可以简单地使用这个:
\documentclass{article}
\usepackage{graphicx}
\begin{document}
\begin{figure}[htpb]
\centering
\includegraphics[width=0.4\linewidth]{example-image-a}
\quad
\includegraphics[width=0.4\linewidth]{example-image-b}
(a)
\caption{Whatever}
\label{fig:name}
\end{figure}
\end{document}
答案2
\documentclass{article}
\usepackage[demo]{graphicx} % omit 'demo' option for real document
\usepackage[font=bf]{caption,subcaption}
\begin{document}
\begin{figure}[ht]
\centering
\begin{subfigure}{\textwidth}
\centering
\includegraphics[width=4cm]{c1.eps}
\qquad % choose separation between c1 and c2
\includegraphics[width=4cm]{c2.eps}
\caption{V} \label{fig:a}
\end{subfigure}
% \caption{(a) and (b) represent circles} \label{fig:wind_speed}
\end{figure}
\end{document}