His scheme for building a perpetual - motion machine is only a pipe dream.
他建造永动机的商量只是空想罢了.
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A perpetual motion machine would have to be frictionless.
永动机只能是一种无摩擦力的机器.
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This will be a whole new experience for you, the perpetual - motion machine.
对你这台永动机来说,这将是一全新的体验.
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