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

145. The ducks must quickly prise the mussels free before the tide starts to turn.
     绒鸭必须赶在潮流转向之前迅速采食
146. The window of opportunity is short.
     机会之窗随时可能关闭
147. 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
148. 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
149. The diners attract others.
     其它生物也似乎闻风而来
150. 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
151. Musk oxen create their own.
     麝牛创造了自己的生命线

来自《行星地球 第一季 第六集 Planet Earth S01E06 冰雪世界》第 148 行