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收集设备 : 19 phrases in 9 subjects |
| Aviation | 3 |
| Earth sciences | 2 |
| Ecology | 1 |
| Electronics | 5 |
| Geophysics | 1 |
| International trade | 1 |
| Metallurgy | 1 |
| Navigation | 1 |
| Technology | 4 |
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