Graphics3D[Polygon[{{2, -3, 3}, {2, -3, -3}, {2, 3, -3}, {2, 3, 3}}], PlotRange -> {{-3, 3}, {-3, 3}, {-3, 3}}, Axes -> True, AxesLabel -> {"x", "y", "z"}]可以用一个多边形Polygon来表示一个平面
