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| "Ultra-Light" (直升机(英)) | |||
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极 轻 : 29 phrases in 12 subjects |
| Agriculture | 2 |
| Architecture | 2 |
| Automobiles | 1 |
| Drilling | 8 |
| Earth sciences | 2 |
| Electronics | 1 |
| Engineering geology | 1 |
| General | 2 |
| Geology | 2 |
| Oil / petroleum | 2 |
| Space | 1 |
| Technology | 5 |
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