1.And some polar bears in the Arctic are shedding pounds during the time they should be beefing up.
beef up加强
That was seen as a campaign to beef up American forces in Europe.
那件事被认为是美国在欧洲加强军事力量的活动 。
2.They blame global warming for the dwindling ice cover on the Arctic Ocean that bears need for hunting seals each spring.
dwindlle 减少
Mee questions whether it is "fair" to reintroduce a jaguar, because of not only the dwindling rainforest but also the impact "on the people who live and farm there".
梅伊阐释并再提出这种说法对美洲虎是公平的,不仅是因为热带雨林正在减少而且也会影响到那些生活和耕作在那里的人们 。