要符合能量守恒原理，末总动能必须比初动能大这么多。

In order for energy to be conserved, the final total kinetic energy must be greater than the initial by this amount.

youdao

物体或物体系的总动能等于每种运动方式的动能之和，取决于质量和速度。

The total kinetic energy of a Body or system is equal to the sum of the kinetic energies resulting from each type of motion. The kinetic energy of an object depends on its mass and velocity.

youdao

多数这些好象是很统一，因此靠维里法则总动能应该是星系总引力聚合能的一半。

Many of these appear to be fairly uniform, so by the virial theorem the total kinetic energy should be half the total gravitational binding energy of the galaxies.

youdao

And we know that n describes the total energy, that total binding energy of the electron, so the total energy is going to be equal to potential energy plus kinetic energy.

我们知道，n是描述总能量的，电子总的结合能，所以总能量，等于,势能加动能。

麻省理工公开课 - 化学原理课程节选