internal kinetic energy

例句：

1. 1. The engine's internal kinetic energy is releasedwhen it is running.
   发动机运行时释放其内部动能。
2. 2. The scientist used the internalkinetic energy of the falling ball to calculateits velocity.
   科学家利用下落球的内部动能来计算其速度。
3. 3. The car's internalkinetic energy was converted into mechanical energyby the gears.
   汽车的内能通过齿轮转换为机械能。