ice cap

例句：

1. 1. The glacier is slowly advancing towards the coast.
   冰川正在缓慢地向海岸推进。
2. 2. The ice sheet is a major source of fresh water for the region.
   冰盖是该地区的主要淡水来源。
3. 3. The polar ice cap is melting at an alarming rate.
   极地冰盖以惊人的速度融化。