The sea ice breaks up every year, but now this is happening earlier, and the bears』 limited hunting season is getting shorter.
海冰每年都會破裂，但現在這種情況發生得更早了， 北極熊有限的狩獵季節變得越來越短。
break up 破裂
earlier 更早
hunting season 狩獵季節
This is already having a profound impact.
這已經產生了深遠的影響。
profound 深遠的
impact 影響
Cubs are growing up underweight, which reduces their chances of survival.
小熊在成長規程中體重不足，這就降低了它們生存機率。
grow up 長大；成熟
underweight 低於一般重量的；重量不足的
reduce 減少
survival 存活；倖存
Within the lifetime of these cubs, the Arctic in summer could be largely free of sea ice.
在這些幼崽的一生中，夏天的北極，可能基本上沒有海冰。
lifetime 一生；壽命；有生之年
cub 幼小的獸
largely 大部分地；主要地
be free of 免於
It’s not just the sea ice that is vanishing.
正在消失的不僅僅是海冰。
vanish 消失
The ice that lies on land is also changing fast.
陸地上的冰也在快速發生變化。
lie 位於；躺