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| perpetual-motion machines | |||
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永动机 : 43 phrases in 12 subjects |
| Air defense | 1 |
| Automobiles | 4 |
| Aviation | 3 |
| Chemistry | 2 |
| Compressors | 1 |
| Drilling | 1 |
| Electric machinery | 12 |
| Electronics | 6 |
| General | 4 |
| Refrigeration | 1 |
| Technology | 7 |
| Wind Energy | 1 |
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