also perpetual-motion
The idea of perpetual motion is the idea of something continuing to move for ever without getting energy from anything else.
N-UNCOUNT
also perpetual-motion
The idea of perpetual motion is the idea of something continuing to move for ever without getting energy from anything else.
N-UNCOUNT
Collins COBUILD Advanced Learner's English Dictionary. Английский словарь Коллинз COBUILD для изучающих язык на продвинутом уровне. 2006