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。
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。
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。
The LS coupling representation of electron -ion system is used, the exchange effect is taken into account and the angular factors of collision matrix elements are treated in detail.
其中采用了电子与离子系统的LS耦合表象，考虑了交换效应，仔细处理了碰撞矩阵元的角部分因子。
Absrtact: Collision detection is an important component of virtual reality system. It plays a vital role in the reality of the virtual navigation and expression of dynamic elements.
摘要：碰撞检测是虚拟现实系统的一个重要组成部分，它对虚拟场景漫游及动态元素表达的真实性起着至关重要的作用。
The ground - based simulation tests demonstrated that the space dust collision could result in the damage of the above materials and elements to different extent.
地面模拟试验表明，空间粉尘高速撞击下对这些材料与元器件会产生不同程度的损伤。
The ground - based simulation tests demonstrated that the space dust collision could result in the damage of the above materials and elements to different extent.
地面模拟试验表明，空间粉尘高速撞击下对这些材料与元器件会产生不同程度的损伤。
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