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| 41. | To keep watch. |
| 监视,守望 |
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| 42. | Puesto de Vigilancia |
| 监视岗哨 |
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| 43. | wagon monitoring |
| 货车监视 |
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| 44. | thermal surveillance |
| 热监视 |
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| 45. | epidemiological surveillance |
| 流行病学监视 |
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| 46. | battlefield surveillance |
| 战场监视 |
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| 47. | supervised tour |
| 监视巡查 |
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| 48. | electronic surveillance |
| 电子监视 |
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| 49. | area surveillance |
| 地区监视 |
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| 50. | hurricane watch |
| 飓风监视 |
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