polar circle [天] [测] 极圈 ; [数] 极圆
north polar circle [地理] 北极圈
Polar Circle Marathon 北极圈马拉松
Polar Circle boats 极地圈号船
the polar circle 北极圈
polar mohr circle 极摩尔圆
If you live near the Arctic Circle, hug the closest polar bear.
如果你生活在北极圈附近，请拥抱离你最近的北极熊。
Founders of the polar circle diving center are making holes in the ice with help of hand drills and augers.
极地圈中心的创建者正在冰里用钻孔机钻孔。
But, if it's like a circle or a half circle, or things like that, then even if a problem doesn't tell you to do it in polar coordinates you might want to seriously consider it.
但是如果它是一个圆或者半圆，或者是类似的，即使题目没有提示你在极坐标里做，你也应该认真考虑一下。
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