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| 红外线被动源 | |||
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infrared passive : 34 phrases in 8 subjects |
| Air defense | 3 |
| Aviation | 4 |
| Electronics | 9 |
| Engineering geology | 1 |
| Oil / petroleum | 1 |
| Space | 10 |
| Technology | 5 |
| United Nations | 1 |
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