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| trend surface | |||
| 趋势面: 24 phrases in 9 subjects |
| Aviation | 2 |
| Business | 1 |
| Earth sciences | 1 |
| Ecology | 1 |
| Economy | 2 |
| Engineering geology | 3 |
| Oil / petroleum | 5 |
| Space | 1 |
| Technology | 8 |
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