By what works in other places, I mean that this is nothing like the theory of the perpetual motion machine, which is unworkable even in principle.

他山之石，我的意思是这并不是永动机理论，这个理论在原理上本就不通。

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

He is adamant that this is not a perpetual motion machine, and does not violate the law of conservation of momentum because different reference frames apply to the drive and the waves within it.

他坚持认为这并非永动机，也没有违反能量守恒定律，因为驱动器和里面的微波使用不同的坐标系。

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。

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The directors, Jean-Pierre and Luc Dardenne, track the young perpetual-motion machine through his small Belgian city, where he pedals, runs, scampers, dives, and climbs past all clutches, and, when cornered, fights with an animal ferocity.

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Telecoms were going to carry workers along the information superhighway to the land of effortless wealth, and dotcoms promised to turn the stock market into a sort of perpetual-motion money-making machine at least until the Y2K bug brought the entire world to a crashing halt.

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This was the recently popular idea that a market leader can increase sales faster than it accumulates expenses, thus creating a turbocharged, perpetual-motion profit machine at least until the U.S. Justice Department decides to break it up.

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