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| passive infrared detector | |||
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| passive infrared | |||
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被动红外 : 20 phrases in 8 subjects |
| Aviation | 1 |
| Earth sciences | 1 |
| Electronics | 8 |
| Engineering geology | 1 |
| Oil / petroleum | 1 |
| Space | 3 |
| Technology | 4 |
| United Nations | 1 |
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