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频谱学 : 22 phrases in 9 subjects |
| Air defense | 1 |
| Earth sciences | 1 |
| Geology | 1 |
| Metallurgy | 3 |
| Oil / petroleum | 4 |
| Plastics | 1 |
| Shipbuilding | 1 |
| Space | 2 |
| Technology | 8 |
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