Then the sun shone free, lighting the pearly gray surface of the cloud-like sea and making it glow.

然后太阳自由地照耀着， 照亮了云状大海珍珠灰色的表面， 使它发光。

However, when a material has a roughness set to 100%, then  the secondary rays will bounce in entirely random directions resulting in a flat gray surface.

然而， 当材质的粗糙度设置为 100% 时，次级射线将在完全随机的方向上反射， 从而产生平坦的灰色表面。