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| 71. | tracking generator |
| 跟踪发生器 |
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| 72. | optical tracking |
| 光学|跟踪 |
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| 73. | track floppy-disk |
| 跟踪软盘 |
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| 74. | tracking receiver |
| 跟踪接收机 |
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| 75. | track following |
| 磁道跟踪 |
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| 76. | tracking frequencies |
| 跟踪频率 |
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| 77. | tracker processor |
| 跟踪处理机 |
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| 78. | tracking network |
| 跟踪网 |
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| 79. | tracking condenser |
| 跟踪电容器 |
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| 80. | tracking television |
| 跟踪电视 |
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