Method type body is defined without member function declared for creating object type.
定义了方法类型正文，但没有声明用于创建对象类型的成员函数。
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.
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.
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。
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