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| 51. | immunologic surveillance |
| 免疫学监视 |
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| 52. | guarded the door. |
| 监视门口 |
|
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| 53. | monitor kinescope |
| 监视显象管 |
|
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| 54. | surveillance of disease |
| 疾病监视 |
|
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| 55. | monitored variable |
| 监视变量 |
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| 56. | long-distance supervisory control |
| 遥控监视 |
|
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| 57. | photographic surveillance |
| 照相监视 |
|
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| 58. | watch dog relay |
| 监视继电器 |
|
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| 59. | continuous surveillance |
| 连续监视 |
|
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| 60. | sea surveillance |
| 海域监视 |
|
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