... polar system 极坐标系 polar tip 极尖 polar vector 极矢量 ...
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crack-tip polar radius deformation multiplier 裂尖极半径变形乘子
In this image by Paul Nicklen, a polar bear swims in icy water off the northern tip of Baffin Island, a tactic the bears often use to surprise prey.
在保罗尼·克伦的这幅照片中，一只北极熊在巴芬岛北端冰冷的水中游泳，这是北极熊经常用于突击猎物的战术。
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