But the once impenetrable ice that prevented ships travelling along the northern Russian coast has been retreating rapidly because of global warming in recent decades.

但是，由于近几十年来的全球变暖，曾经阻止船只沿俄罗斯北部海岸航行的冰面迅速消退。

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But the once impenetrable ice that prevented ships travelling along the northern Russian coast has been retreating rapidly because of global warming in recent decades.

但是，由于近几十年来的全球变暖，曾经阻止船只沿俄罗斯北部海岸航行的冰面迅速消退。

youdao