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| 71. | guided earth satellite |
| 可控地球卫星 |
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| 72. | earth-rate correctio |
| 地球转速修正 |
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| 73. | earth-space communication |
| 地球－航天通信 |
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| 74. | satellite earth station |
| 卫星地球站 |
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| 75. | earth atmospheric optics |
| 地球大气光学 |
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| 76. | horizontal earth rate |
| 水平地球速率 |
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| 77. | moon-earth trajectory |
| 月球地球飞行轨道 |
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| 78. | constitution of earth |
| 地球的组成 |
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| 79. | layered earth model |
| 层状地球模型 |
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| 80. | Planet Earth Council |
| 行星地球理事会 |
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