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示踪 线 : 20 phrases in 10 subjects |
| Agriculture | 1 |
| Air defense | 1 |
| Aviation | 1 |
| Electronics | 2 |
| Fishery fishing industry | 1 |
| Geophysics | 1 |
| Metallurgy | 2 |
| Oil / petroleum | 4 |
| Technology | 5 |
| Wind Energy | 2 |
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