polar star
北极星, 是美国制造的破冰船
例句与用法：
Most insect do not live in polar region.
大多数的昆虫不在极地地区生存。
polar starnoun- (Astronomy)a star at or close to a celestial pole, especially the Pole Star
(天文)极星，尤指北极星
polar star
名词 polar star:
the brightest star in Ursa Minor; at the end of the handle of the little dipper; the northern axis of the earth points toward it
同义词：Polaris, North Star, pole star, polestar