That could be because the collision that made the moon in the first place was so hot that volatile elements like hydrogen, a key component of H2O, largely burned away.

这可能是因为月球形成过程中，撞击产生的热能使挥发性氢元素——水的重要组成成分——大量流失。

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I described and analyzed the flow chart of the collision detection algorithm of hierarchical bounding volume and intersection testing method of the basic geometrical elements.

分析了层次包围盒碰撞检测算法的实现流程和基本几何元素间的相交测试计算。

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An unfolding collision around a group of elements known as "rare earths" is seen by some as a test of China's willingness to reciprocate.

围绕一组称为“稀土”的元素展开的意见冲突，被有些人视为，中国是否愿意互惠的试金石。

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