... centre of mass angle 质心系角 centre of mass system 质心系 ; 惯心系统 centre of mass motion 质心运动 ...
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... energy， center-of-mass 质心能量 center-of-mass frame 质心系 system， center-of-mass 质〔量中〕心系统 ...
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... center of mass 质心，质量中心，惯性中心，重心 center-of-mass system 质心系 center of movement 运动中心 ...
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在质心系中，解决两体问题，具有形式对称，描述简洁，精确度高等优点。
In center of mass system, solved problem of two body had merits of symmetry form, brief description and high precision.
用质心坐标系分析了二体问题的运动方程，并用质心系讨论了两个粒子间的弹性碰撞问题。
This paper analyses the two body problem of kinematical equation and discusses the elastic collision between two particles in the center of mass system.
在实验室坐标系下，给出吸能核反应所要求的阈能，其结果与质心系下得到的结果完全一致。
The threshold energy formula of nuclear reaction in which energy is absorbed is obtained using laboratory frame. It is consistent with the result obtained in mass center frame.
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