在beamer的封面加上
1） Joint work with Prof. xxx and Prof. xxx
2） 兩個不同的作者單
\title{xxxxx}
\author[ author ]{author1\inst{1} \\ \small{Joint work with Prof. author2\inst{1} and Prof. author3\inst{2}}}
\institute[ cug] % (optional, but mostly needed)
{
\inst{1}
School of Computer Science\\
China University of Geosciences (Wuhan)
\and
\inst{2}
Department of Mathematical Sciences\\
University of Cincinnati
}
\date{\today}
\begin{frame}[plain]
\titlepage
\end{frame}