1.Aurora Ovals are elliptical zones which produced by Aurora, the centered by polars magnetic in Arctic and Antarctica.
极光卵是极光粒子沉降以磁极为中心在地球南北极地区形成的椭圆带状区域。
2.This paper studies and discusses polars of lattice by using lattice theory, and obtains some results.
利用格论知识的一些方法与技巧,对格的极进行了研究与探讨,得到了一些很好的结果。