不管冬天还是夏天，北极都覆盖着冰雪。

Whether in summer or in winter, the North Pole is covered with ice and snow.

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当太阳不再直射北极时我们是冬天。

When the sun is not shining on the North Pole at all, we have winter.

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当太阳不再直射北极时我们是冬天。

When the sun is not shining on the North Pole at all, we have winter.

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