当科学家们飞到遥远的西伯利亚研究永久冻土带时，他们发现了一处一直在膨胀的北极湖。
When scientists fly into remote areas of Siberia to study permafrost, they gaze down on an endless expanse of arctic lakes.
当科学家们飞到遥远的西伯利亚研究永久冻土带时，他们发现了一处一直在膨胀的北极湖。
When scientists fly into remote areas of Siberia to study permafrost, they gaze down on an endless expanse of arctic lakes.
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