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| trace amount | |||
| 跟 踪量: 50 phrases in 10 subjects |
| Air defense | 8 |
| Aviation | 7 |
| Earth sciences | 1 |
| Electronics | 6 |
| Explosives and Explosive Ordnance Disposal | 2 |
| Information technology | 1 |
| Multimedia | 1 |
| Oil / petroleum | 1 |
| Space | 21 |
| Technology | 2 |
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