N-UNCOUNT Pack ice is an area of ice that is floating on the sea. It is made up of pieces of ice that have been pushed together. 积冰
Pack ice around Iceland was becoming a threat to navigation.
冰岛周围的浮冰一度成为船舶航行的威胁。
They spent weeks tracking and recording the hunting behaviour in the pack ice off the coast of the Antarctica Peninsula.
他们花了几个星期的时间在南极洲的半岛的冰盖上跟踪和记录虎鲸的狩猎的行为。
More tantalising bear prints were spotted, crimping the edge of pack ice, making their big-footed way across a small floe.
我们看到了更多引人入胜的熊爪印，它们的大脚掌在浮冰上行进。
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