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1·The earth is an oblate spheroid - a sphere with flattened poles and a slight bulge at the equator.

地球是一个扁平的球体—一个具有扁平的两极和赤道附近稍稍凸出的球体。

2·He shows that the earth is not a true sphere but an oblate spheroid and calculates the flattering.

他证明地球不是一个真的球而是一个扁球，而且计算了扁平度。