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答案1
像这样吗?
\documentclass{article}
\usepackage{multirow}
\usepackage{graphicx}
\usepackage{array}
\newcolumntype{C}[1]{>{\centering\arraybackslash}m{#1}}
\begin{document}
\renewcommand{\arraystretch}{1.5}
\begin{tabular}{|C{3cm}C{3cm}C{3cm}|c}
\multicolumn{1}{c}{\Large User 1} & \Large User 2 & \multicolumn{1}{c}{\Large User 3} & \\\cline{1-3}
\strut &&&\multirow{3}{*}{\rotatebox{-90}{Phase1}}\\
\strut &&&\\
Operation1 & Operation1 &&\\\cline{1-3}
\strut Operation1 && Operation1 &\multirow{3}{*}{\rotatebox{-90}{Phase2}}\\
\strut &&&\\
\strut & Operation1 &&\\\cline{1-3}
\strut & Operation1 &&\multirow{3}{*}{\rotatebox{-90}{Phase3}}\\
\strut && Operation1 &\\
Operation1 & Operation1 &&\\\cline{1-3}
\end{tabular}
\end{document}