往年这个时候，它们应该在漂浮在这片大陆架地区食物丰富的海域上的冰面上捕食。
This time of year, they should be foraging from the sea ice floating over the productive waters of the continental shelf.
这项禁令是1981年生效的。禁令涵盖了美国超过百分之80以上的海岸线和大陆架地区。
The ban, which has been in effect since 1981, covers more than 80 percent of the U.S. coastline and the outer continental shelf.
另一纠纷就是斯匹卑尔根岛之争，俄罗斯宣称自1920年开始就有用那里的开矿权，俄挪威则称挪威拥有那里的环大陆架地区。
Another dispute is around the island of Spitsbergen, on which Russia has had mining rights since 1920. Norway says it owns the continental shelf around it.
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