有段时期温度过高，融化了极地的部分冰层。

There was a period of excessive warmth which melted some of the polar ice.

《柯林斯英汉双解大词典》

随着温度的上升，极地的冰会以更快的速度融化。

With the temperature rising, polar ice will melt at a faster rate.

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其次，极地的大气层很薄，所以加热它所需要的能量很少。

Second, the polar atmosphere is thin, so little energy is required to warm it.

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