名词短语
中文翻译：椭球体的扁平化
同义词：
['flattening of an ellipsoid', 'flattening of a sphere']
例句：
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1. The shape of the planet is primarily determined by its flattening of an ellipsoid.
行星的形状主要由其椭球体的扁平程度决定。
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2.The flattening of the Earth's surface is due to its rotation around its axis.
地球表面扁平化是由于其绕轴旋转造成的。
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3. The flattening of the Earth's crust has been observed during satellite observations.
卫星观测显示，地球地壳的扁平化现象已经出现。