close pack-ice密集流冰群
pack-ice大块浮冰
very open pack ice[海洋] 全分离流冰;非常稀疏漂流冰
Antarctic Pack Ice Seals南极浮冰海豹
very close pack ice密集流冰;非常密集漂流冰;非常密集流冰群
open pack ice稀疏冰;稀疏块冰;开裂浮冰
consolidated pack ice堆积厚冰
compact pack ice密集堆冰
rafted pack ice筏形流冰群
N-UNCOUNT（不可数名词） 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