• 1. open pack ice: 稀疏冰
• 2. very open pack ice: 全分离流冰 | 非常稀疏漂流冰

• 1.As the Arctic ice pack spread southward, Norse voyages to the west were rerouted into the open Atlantic, then ended altogether.
  由于北极的大片浮冰向南移动，挪威人的航行路线由向西航行改成了向开阔的大西洋航行，后来向西的航行整个都终止了。
  dict.yoduao.com
• 2.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。
  dict.yoduao.com

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