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| 屏障系统 | |||
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barrier system : 12 phrases in 10 subjects |
| Air defense | 1 |
| Aviation | 1 |
| Earth sciences | 1 |
| Ecology | 1 |
| Electronics | 1 |
| Geology | 1 |
| Oil / petroleum | 1 |
| Securities | 1 |
| Space | 1 |
| Technology | 3 |
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