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波动 源 : 12 phrases in 9 subjects |
| Air defense | 1 |
| Communications | 1 |
| Earth sciences | 1 |
| Ecology | 1 |
| Electric machinery | 3 |
| Oil / petroleum | 1 |
| Project management | 1 |
| Technology | 2 |
| Water resources | 1 |
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