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61. | optical tracking |
| 光学|跟踪 |
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62. | contour tracking |
| 轮廓|跟踪 |
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63. | satellite tracking |
| 卫星跟踪 |
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64. | track following |
| 磁道跟踪 |
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65. | selective trace |
| 选择跟踪 |
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66. | antenna tracking |
| 天线跟踪 |
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67. | parameter tracking |
| 参数跟踪 |
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68. | track floppy-disk |
| 跟踪软盘 |
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69. | odorifercus homing |
| 气味跟踪 |
|
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70. | tracker processor |
| 跟踪处理机 |
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