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| 71. | polar orbit |
| 极轨道 |
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| 72. | earth orbital vehicle |
| 地球轨道运载器；地球轨道飞行器 |
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| 73. | transfer orbit |
| 过渡轨道 |
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| 74. | synchronous satellite orbit |
| 同步卫星轨道 |
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| 75. | Orbiting Astronomical Observatory |
| 轨道天文台 |
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| 76. | transfer between orbits |
| 轨道过渡 |
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| 77. | track component |
| 轨道组成部分 |
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| 78. | orbit element |
| 轨道要素 |
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| 79. | track resolution |
| 轨道分辨力 |
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| 80. | parking orBit |
| 驻留轨道 |
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