A perpetual motion machine would have to be frictionless.
永动机只能是一种无摩擦力的机器。
Downfall of the dream of the first perpetual motion engine
第一类永动机幻梦的破灭
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。
Perpetual motion is one of the important physical concepts.
永久运动是重要物理概念之一。
Innovation, Be The Perpetual Motion Machine Of Outdoor Advertising Glamour
创新 户外广告魅力的永动机
The everlasting is mankind the perpetual motion of the peaceful happiness.
天长地久是人类平安幸福的永恒运动。
And an unrealistic goal like inventing a perpetual motion machine is absolutely meaningless.
而像发明永动机这样不切实际的目标则毫无意义。
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