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| 71. | preliminary orbit |
| 初始轨道 |
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| 72. | principal orbit |
| 主轨道 |
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| 73. | overhead runway |
| 架空轨道 |
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| 74. | orientation of orbit |
| 轨道定向 |
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| 75. | overlapping orbitals |
| 重叠轨道 |
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| 76. | race track effect |
| 轨道效应 |
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| 77. | Bring(or channel; incorporate)into the orbit |
| 纳入轨道 |
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| 78. | occupied orbital |
| 占有轨道 |
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| 79. | orbit lifetime |
| 轨道寿命 |
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| 80. | spiral trajectory |
| 螺线轨道 |
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