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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Lobsters live on rocky, sandy, or muddy bottoms from the shoreline to beyond the edge of the continental shelf.

龙虾生活在大陆架边缘海岸处的岩石，沙土，或泥底。

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First, the chilly Malvinas Current, a north-flowing branch of the Antarctic Circumpolar Current, flows north along the edge of the South American continental shelf.

首先，环南极洋流的一支——马尔维纳斯寒流向北流动，流经南美洲大陆架的边缘。

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Although there is no official IOC continental rotation policy, correspondents say the Americas may have an edge as previous games will have been held in Asia, Europe, and Australasia.

BBC: Obama to woo IOC over Chicago bid