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根据地理学规定,海与洋不同之处在于它必须有岸。可是大西洋北部的萨尔加索海却没有一处和大陆相连,成为世界上唯一的无岸海。
According to the geography rules, the difference between sea and ocean is that it must have a shore. However, the northern Atlantic Sal do not have a sea and the mainland connected to become the world's only non-shore sea.