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。
The polar bear, which is native largely to the Arctic circle, is the world's largest carnivore species found on land. It is also the largest species of bear.
北极熊主要生活在北极圈内，它们是已知的最大陆地食肉动物，而且还是最大的一种熊类。
The polar equation of non-circular gear pitch curve, calculation method of center distance, formula of pitch curve length, primary circle radius and pressure Angle is given.
给出了非圆齿轮的节曲线极坐标方程，两齿轮中心距的计算方法，节曲线长度、基础圆半径和压力角的计算公式。
Yukonof Canada, nearby Alaska, has a comfortableexquisite polar environment of the Arctic Circle. Sledding dogs are the most faithful fellow of Eskimo;
加拿大的域空，接近美国的阿拉斯加，拥有北极圈里舒适、优美的极地环境。
Yukonof Canada, nearby Alaska, has a comfortableexquisite polar environment of the Arctic Circle. Sledding dogs are the most faithful fellow of Eskimo;
加拿大的域空，接近美国的阿拉斯加，拥有北极圈里舒适、优美的极地环境。
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