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41. | antenna tracking |
| 天线跟踪 |
|
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42. | light pen tracking |
| 光笔跟踪 |
|
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43. | contour tracking |
| 轮廓|跟踪 |
|
|
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44. | track floppy-disk |
| 跟踪软盘 |
|
|
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45. | satellite tracking |
| 卫星跟踪 |
|
|
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46. | odorifercus homing |
| 气味跟踪 |
|
|
| |
47. | selective trace |
| 选择跟踪 |
|
|
| |
48. | optical tracking |
| 光学|跟踪 |
|
|
| |
49. | parameter tracking |
| 参数跟踪 |
|
|
| |
50. | track following |
| 磁道跟踪 |
|
|
| |