1.And some polar bears in the Arctic are shedding pounds during the time they should be beefing up.
beef up加強
That was seen as a campaign to beef up American forces in Europe.
那件事被認為是美國在歐洲加強軍事力量的活動 。
2.They blame global warming for the dwindling ice cover on the Arctic Ocean that bears need for hunting seals each spring.
dwindlle 減少
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".
梅伊闡釋并再提出這種說法對美洲虎是公平的,不僅是因為熱帶雨林正在減少而且也會影響到那些生活和耕作在那里的人們 。