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51. | air qualitysurveillance |
| 大气质量监视 |
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52. | EWR (early-warning radar) |
| 预先警报雷达|远程警戒雷达 |
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53. | radar approach control |
| 雷达进场控制;雷达临场指挥 |
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54. | monitoring equipment |
| 监视设备 |
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55. | master supervisory and alarm frame |
| 集中监视报警装置集中监视警报装置 |
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56. | have one's eyes wide open; be careful |
| 监视;警戒 |
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57. | keep a lookout for the enemy |
| 监视敌人 |
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58. | monitoring contro |
| 监视控制 |
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59. | watchdog subsystem |
| 监视子系统 |
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60. | off site surveillance |
| 场外监视 |
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