北极变暖意味着航运和财富的争夺

fragile – adj. easily broken or damaged

cruise – adj. a kind of boat or ship that travels to a number of places for vacation

adventure tourism – n. tourism that involves travel to remote areas and usually involve physically challenging activities

realization – n. the state of understanding or becoming aware of something

deposit – n. an amount of a substance (such as oil or coal) that exists naturally in the ground

icebreaker – n. a special ship that can move through icy water by cutting the ice

complicated – adj. something that is sure to happen or be successful

Nordic – adj. of or relating to Sweden, Norway, Denmark, and sometimes Finland and Iceland, or to the people who live there

ice floe – n. a large, flat area of ice floating in the ocean

ice sheet – n. a very large and thick area of ice that covers a region

frontier – n. a distant area where few people live

ridge – n. a long area of land that is on top of a mountain or hill