Not long after this, warming climate and melting ice raised sea levels sharply so that the land-bridge to Asia flooded once again.
没过多久,全球气候变暖,冰川融化,海平面大幅度回升,再次淹没了通往亚洲的大陆架。
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A likely explanation for this involves the fact that intercontinental migrations require both a landbridge connecting the two continents and the suitable habitat both on and across that landbridge.