polar
/ˈpəulə(r); `polɚ/ adj[attrib 作定语]
1 of or near the North or South Pole （南、 北）极的; 地极的; 近地极的
polar ice 地极的冰 * the polar regions 极区.
2 of (one of) the poles of a magnet 磁极的
polar attraction 极向引力.
3 (fml 文) (of opposites) complete; extreme （指相对的事物）完全相反的, 极端对立的.