名词
中文翻译：初始极面半径
同义词：
['initial radial distance', 'initial radial radius']
例句：
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1. The initial metacentric radius ofthe planet is about 390,000 kilometers.
该行星的初始极面半径约为39万千米。
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2.The initial radial distance between thetwo stars is approximately 4 light-years.
两颗恒星之间的初始径向距离大约为4光年。
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3. The initialradial radius of the planet'score is much smaller than its surface.
该行星核心的初始径向半径远小于其表面。