使用说明 Usage: 隐藏 hide

The 3D model can be manipulated by clicking 使用旋转，放大，平移和亮度
on the rotate, zoom, pan or light buttons 四个按钮及鼠标控制3D模型
and dragging the mouse

Alternately, use shortcut keys and mouse drag 或使用快捷键和鼠标
rotate:shift + mouse drag旋转：shift + 鼠标
zoom:control + mouse drag 放大：ctrl + 鼠标
pan:alt + mouse drag 平移：alt + 鼠标
light:shift + alt + mouse drag 亮度：shift + alt + 鼠标