The hard sphere model is used to describe inter-particle collisions.
采用硬球模型描述颗粒问碰撞作用。
The hard sphere model was used to describe inter-particle collisions.
采用硬球模型描述颗粒间的碰撞作用。
The two-sphere model arises from some very simple observations of the stars which anyone can make.
这种双球面学说是根据任何人都能做到的对星星的简单观察而提出的。
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