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| 51. | antichemical security |
| 对化学警戒 |
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| 52. | place(guards)in position |
| 布置（警卫）警戒. |
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| 53. | antisubmarine screen |
| 反潜警戒网 |
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| 54. | warning radar antenna |
| 警戒雷达天线 |
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| 55. | rocket warning radar |
| 火箭警戒雷达 |
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| 56. | distant early-warning line |
| 远程警戒雷达网 |
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| 57. | aircraft warning light |
| 防空警戒灯 |
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| 58. | proximity warning radar |
| 近程警戒雷达 |
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| 59. | aircraft emergency alert |
| 飞机紧急警戒 |
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| 60. | ocean surveillance ship |
| 海洋警戒船 |
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