| 单词 | perpetual motion |
| 释义 | perpetual motionperˌpetual ˈmotion noun [uncountable] 1the idea that a machine would be able to continue moving forever without getting energy from anywhere else, which is not considered possible2be in perpetual motion informal to be very active for a long time without stopping: She seemed to be in perpetual motion, never stopping to relax. |
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