答案1
像这样吗?
\documentclass{article}
\usepackage{tikz}
\usepackage{lipsum}
\begin{document}
\begin{tikzpicture}[remember picture,overlay]
\node[anchor=west] at (current page.west) {\rotatebox{270}{\parbox{\textheight}{\lipsum[1]}}};
\end{tikzpicture}
\end{document}