whose entourage grows throughout the day. 它们的活动忙碌一整天
In the Arctic, any breach in the icy barrier can be a lifeline. 在北极 每一处破冰的地方都是一条生命线
These giants have the strength to smash through the frozen crust 这种体型巨大的动物有足够的力量砸出冰窟窿
The window of opportunity is short. 机会之窗随时可能关闭
As the current begins to build, it's up, up and away. 洋流开始转强时它们就只好远走高飞了
These permanent holes in the ice provide seafood throughout the winter. 这个长年不冻的水窟窿提供了整整一个冬天的食物
the sea floor is carpeted with dense mussel beds. 布满了密密麻麻的贻贝
These can only be reached during a brief lull in the currents. 这个地方只有在洋流暂时停歇时才能吃到