星名，指北极星。
北极的定义有很多种，一般而言，是指北极圈内或附近的区域。
The Arctic can be defined in a number of different ways but is generally considered to be the region inside or near to the Arctic Circle.
北冰洋，不出所料，围绕着北极圈(北极圈指北极周围的地区)。
The Arctic Ocean, unsurprisingly, surrounds the Arctic; that is, the regions around the North Pole.
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