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变传动比 : 27 phrases in 9 subjects |
| Agriculture | 1 |
| Astronautics | 1 |
| Automobiles | 18 |
| Aviation | 1 |
| Drilling | 1 |
| Military | 1 |
| Plastics | 2 |
| Technology | 1 |
| Wind Energy | 1 |
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