1. 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。
2. Navigation dangerous on area around the North Pole due to pack ice. 由于多积冰,在北极附近水域航行是危险的。
3. Polar bears living in a large southern edge of the Arctic pack ice zone. 北极熊生活在有大片浮冰的北极南部边缘地带。
4. Icebergs are created when chunks of pack ice break free and float off into open sea. 当大块积冰断裂、漂浮至远海的时候,冰山就形成了。
5. 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。