open surface的用法和樣例：
例句
- Reflection from a rough surface is often called diffuse reflection.
粗糙表面的反射常常叫做漫射。 - It is fairly common these days for modeling applications to render a rough surface for selected objects, while leaving unselected objects as wire frames.
所有對象都需要用邊框代表，建模應用程序通常只繪制所選對象的粗糙表面，而用線(xiàn)框代表未選對象。
