It had been assumed that the ice extended westward from the Alaskan/Canadian mountains to the very edge of the continental shelf, the flat, submerged part of the continent that extends into the ocean.

人们过去曾猜测，冰山从阿拉斯加和加拿大山脉向西延伸到大陆架的最边缘，也就是大陆架扁平的、延伸到海洋中的水下大陆那部分。

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