- Also called: perpetual motion of the first kind motion of a hypothetical mechanism that continues indefinitely without any external source of energy. It is impossible in practice because of friction
| 单词 | perpetual motion |
| 释义 | WordReference Random House Unabridged Dictionary of American English © 2024 perpet′ual mo′tion, [Mech.]
Collins Concise English Dictionary © HarperCollins Publishers:: perpetual motion n
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