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| environmental surveillance | |||
| surveillance of environment | |||
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| environmental surveillance | |||
| 环境监视: 18 phrases in 7 subjects |
| Aviation | 1 |
| Earth sciences | 2 |
| Ecology | 2 |
| Electronics | 5 |
| Environment | 1 |
| Space | 3 |
| Technology | 4 |
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