Indeed, on the atomic scale, perpetual motion is a reality.

的确，从原子尺度看，永恒的运动是一个确实存在的事实。

youdao

So, what that means concretely is if you have a force field that conservative, then you cannot build somehow some perpetual motion out of it.

具体来讲，如果你有一个保守力场，就不可能建立起永恒的运动。

youdao

Making energy like the sun does might too cheap to meter or as uneconomical as a perpetual motion machine.

像太阳一样产生能量可能会太便宜以至于无法计费，或是像永动机一样太不合算。

youdao

That would that would give rise to a perpetual motion machine, breaking of the second law. It can't happen.

否则就会使,得永动机出现，打破第二定律那是不可能的。

麻省理工公开课 - 热力学与动力学课程节选

The same journalists who laugh at the idea of perpetual motion embrace the voodoo of perpetual prosperity.

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Unassuming in wrinkled khakis and a polo shirt, he is in near perpetual motion.

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As a kid trying to play with the perpetual motion machines, how could you create one.

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