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| 71. | earth oblateness |
| 地球扁率 |
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| 72. | figure of the Earth |
| 地球形状 |
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| 73. | general survey of earth |
| 地球概貌 |
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| 74. | terrestrial radiatio |
| 地球辐射 |
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| 75. | earth's electric conductivity |
| 地球电导率 |
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| 76. | Earth Increment |
| 地球增资 |
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| 77. | earth's inner core |
| 地球内核 |
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| 78. | circle the globe |
| 环绕地球 |
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| 79. | earth elasticity |
| 地球弹性 |
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| 80. | terrestrial waveguide |
| 地球波导 |
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