在一些地方，尤其是低空和靠近法线的角度，可以产生明显的地面反弹。
It can produce a significant ground bounce return in some geometries, especially at lower altitudes, or angles approaching the normal.
每接触地面一次，球的反弹高度也随之降低，光也一样。
As the bounce of the ball decreases in the height per contact with the ground so does it's!
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.
过关时选择装备沙滩排球进入充气城堡关卡，在敌人间不断反弹，保证自己与地面接触的次数小于6次即可。
Clear a bouncy castle round when bouncing off the castle floor fewer than 6 times. You should play Bassketball!
过关时选择装备沙滩排球进入充气城堡关卡，在敌人间不断反弹，保证自己与地面接触的次数小于6次即可。
Clear a bouncy castle round when bouncing off the castle floor fewer than 6 times. You should play Bassketball!
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