积极

ji1 ji2

active; energetic; vigorous; positive (outlook); proactive

两极

liang3 ji2

the two poles; the north and south poles; both ends of sth; electric or magnetic poles

北极

bei3 ji2

the North Pole; the Arctic Pole; the north magnetic pole

极点

ji2 dian3

extreme point; pole; the origin (in polar coordinates)

极好

ji2 hao3

fabulous; superb; excellent