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31. | thermal surveillance |
| 热监视 |
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32. | epidemiological surveillance |
| 流行病学监视 |
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33. | supervised tour |
| 监视巡查 |
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34. | performance monitoring |
| 性能监视 |
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35. | area surveillance |
| 地区监视 |
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36. | electronic surveillance |
| 电子监视 |
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37. | battlefield surveillance |
| 战场监视 |
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38. | hurricane watch |
| 飓风监视 |
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39. | To keep watch. |
| 监视,守望 |
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40. | air surveillance |
| 空气污染监视 |
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