| 单词 | perpetual motion of the first kind |
| 释义 | perpetual motion of the first kind in British English (pəˈpɛtʃʊəl ˈməʊʃən əv ðə fɜːst kaɪnd) noun motion of a hypothetical mechanism that continues indefinitely without any external source of energy. It is impossible in practice because of friction another term for perpetual motion (sense 1) |
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