A perpetual motion machine would have to be frictionless.
永动机只能是一种无摩擦力的机器。
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。
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。
Charles Redheffer raised large sums of money in Philadelphia with a perpetual motion machine and then took it to New York in 1813, where hundreds paid a dollar each to see it.
查尔斯·李德黑法（Charles Redheffer）凭永动机在费城筹集了巨款，又于1813年将它带到纽约，数百人都花一美元来看该机器。
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。
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。
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