假设分子的平动动能相同，设为零。
You assume that all molecules have the same translational energy. You set that equal to zero.
系统的平动动能就是零。
刚体的运动分为平动和转动，那么刚体的动能也就包括平动动能和转动动能。
The motion of a rigid body can be divided into two types: translation and rotation, so the kinetic energy of rigid body is made up of translational energy and rotational energy.
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