He could not pay the cost of running an electric motor.

他付不起开动电动机的费用。

They needed too many batteries to run the motor over long distances at such low speeds.

这些电动车需要太多的电池来驱动马达在如此低的速度下跑很远的距离。

" Oh, yes, they run motor coaches down your street, but they don't tramp your flowers into the ground" .

“哦，是的，他们在你的街道上开着大客车，但他们不会把你的花踩到地上”。

If you can generate a large burst of energy simply by running a motor for a long time the power of the motor is no longer the limiting factor The spring is.

如果只需长时间运行电机即可产生大量能量，那么电机的功率就不再是弹簧的限制因素。