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| 41. | tracking direction |
| 跟踪方向 |
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| 42. | optical lock-on |
| 光学跟踪;光学锁定;光学自动跟踪 |
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| 43. | laser tracking |
| 激光跟踪 |
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| 44. | tracking indicator |
| 跟踪指示器 |
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| 45. | Tracking station |
| 跟踪站 |
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| 46. | tracking console |
| 跟踪台 |
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| 47. | trace program |
| 跟踪程序 |
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| 48. | tracking filter |
| 跟踪滤波器 |
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| 49. | tracking computer |
| 跟踪计算机 |
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| 50. | tracking telescope |
| 跟踪望远镜 |
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