BBC听力 | 冰雪世界 18
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In these new surroundings he is a surprisingly adept swimmer.
在这个新的环境里，它的游泳本领令人吃惊
Once an extremely rare sight
曾有一次罕见的景象
polar bears have recently been seen over 60 miles from the shore.
最近人们看到北极熊甚至会游到离海岸60英里（1英里约等于1609米）
There is now no turning back for this bear.
这只北极熊不可能再返回了
He's forced to head out into deeper water.
它不得不游向更远的水域，
His giant front paws help him to fight the ocean currents.
巨大的前爪可以使它逆流前进
He seems at home in the sea
它看起来在海里游刃有余
but he cannot swim indefinitely.
但它不能一直不停地游下去
He will drown if he doesn't find land somewhere in this vast ocean.
如果在这片巨大的海洋里，找不到一片陆地，它最终会溺水而亡
Walruses are now gathering on low lying islands.
海象在低洼的岛上聚集
They gave birth on sea ice
它们在冰上生下小海象
but with this platform now gone,
但现在冰没有了
they need a new place to haul out and nurse their young.
它们需要有新的地方来把孩子养大
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