pole·star /ˈpolˌstɑr/
北極星,指導者,指導原理
Pole·star n.
1. Polaris, or the north star. See North star, under North.
2. A guide or director.
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polestar
n : 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 [syn: Polaris, North Star, pole
star, polar star]