冰块环绕着海岸，再往外更有大块浮冰飘动着；
There were fringes of ice along the sea margin, with drifting masses further out;
在陆地哺乳动物中，北极熊无疑是长距离游泳冠军。人们经常在距离陆地或者大块浮冰50英里远的地方看到它们。
Polar bears are champion long-distance swimmers among land mammals, and it is not uncommon to find them at sea as far as 50 miles from land or an ice floe.
距离这些大块的陈年浮冰区更远的海洋里，浮冰的尺寸要小得多，小得甚至可以被海洋表层细小洋流任意摆布。
Even farther out to sea than the large fragments of multiyear ice are much smaller pieces of ice—so small that they are at the mercy of even small surface currents.
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