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21. | elevation tracking |
| 仰角跟踪 |
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22. | tracking indicator |
| 跟踪指示器 |
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23. | tracking telescope |
| 跟踪望远镜 |
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24. | closed-loop tracking |
| 闭环跟踪 |
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25. | Tracking velocity |
| 跟踪速度 |
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26. | a tail; a follower |
| 跟踪者 |
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27. | tail a suspect |
| 跟踪嫌疑犯 |
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28. | infrared tracking |
| 红外跟踪 |
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29. | beacon tracking |
| 信标跟踪 |
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30. | following-up type |
| 跟踪型式 |
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