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导航工具( f9) 鼠标左键: 点击并拖放以翻转图形 鼠标中键: 点击并拖放以缩放图形 鼠标右键: 点击并拖放以移动图形
navigation tool (f9) left mouse: click and drag to rotate the view middle mouse: click and drag to zoom in or out right mouse: click and drag to move the view