Earth's midsection bulges in relation to the measurement from pole-to-pole, and the catastrophic land displacement caused a small reduction in the bulge, making the planet more round.

他使得地球比以前变得更“圆”。以两极为标准的话，地球中部是稍稍膨胀的，历经灾难的土地代替原有的部分，让地球变得更圆。

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In order to overcome the unstableness of reduction-to-the-pole at low and intermediate latitude, there are varieties of methods of reduction-to-the-pole.

为了克服在低纬度区磁化极不稳定的问题，出现了多种磁化极方法。

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