冰山是由雪形成的冰架或冰川断裂而成，主要由淡水冰组成，一般漂浮在开阔海域。
Icebergs are large pieces of freshwater ice that break off snow-formed ice shelves or glaciers and float in open water.
海冰灾害同样加大了发生冰区溢油事故的可能，而冰区溢油的防治比开阔海域溢油的防治更加困难。
Sea ice also increased the occurrence of oil spill of ice region. And ince oil spill prevention is much more difficult.
此次远征由波利尼西亚航海协会组织，是要看看古代航海者是否可能曾经这么走下来——走开阔海域。
The expedition, covering 2,500 miles, was organised by the Polynesian Voyaging Society to see if ancient seafarers could have gone that way, through open ocean.
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