Polar(arctic)
adj. having a pair of equal and opposite charges characterized by opposite extremes; completely opposed"extreme and indefensible polar positions"
同义词：diametricdiametricalopposite
located at or near or coming from the earth's poles"polar diameter"; " polar zone"; " a polar air mass"; " Antarctica is the only polar continent"
of or existing at or near a geographical pole or within the Arctic or Antarctic Circles"polar regions"
extremely cold"polar weather"
同义词：arcticfrigidgelidglacialicy
being of crucial importance"the polar events of this study"; " a polar principal"
同义词：pivotal