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21. | battlefield surveillance |
| 战场监视 |
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22. | physiological monitoring |
| 生理监视 |
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23. | Puesto de Vigilancia |
| 监视岗哨 |
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24. | electronic surveillance |
| 电子监视 |
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25. | wagon monitoring |
| 货车监视 |
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26. | area surveillance |
| 地区监视 |
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27. | epidemiological surveillance |
| 流行病学监视 |
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28. | To keep watch. |
| 监视,守望 |
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29. | supervised tour |
| 监视巡查 |
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30. | thermal surveillance |
| 热监视 |
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