We know that some part of light is directly in contact with that ground, it comes back, bounces, just like a ball falling from a height.
我们知道一部分光是直接照射到地面上的，他又返回来，反弹，就像一个球从高处落下一样。
We know that some part of light is directly in contact with that ground, it comes back, bounces, just like a ball falling from a height.
我们知道一部分光是直接照射到地面上的，他又返回来，反弹，就像一个球从高处落下一样。
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