Birds nesting on sheer cliffs, the Arctic fox waiting below to devour the birds that fall short when they try to make the long glide off those cliffs to the safety of the water.
冰面上的北极熊、冰面下的海豹、峭壁上做巢的鸟、为了吞吃那些努力完成滑下悬崖达到安全水域时掉队的鸟而等在下面的北极狐。
They can glide past eddies that would slow them down and then gain extra thrust by "pushing off" the eddies.
它们可以滑过使它们减速的涡流，然后通过“推开”涡流获得额外的推力。
I have this theory that, to us the world is a flat thing we stand on, but to birds it is a cliff they cling to, a huge ball and they cling to the side and then fall off and fly and glide.
我有一种想法，就是对我们来说世界是一个我们所站立的平坦的东西，而对鸟来说是一个它们所依靠的峭壁，一个巨大的球，它们依靠在边上，然后离开、飞翔、滑行。
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