sea ice

例句：

1. 1. The polar bears feed on sea ice during the winter months.
   北极熊在冬季以海冰为食。
2. 2.Icebergs are a common sight in the Arctic Ocean.
   冰山是北极海域的常见景象。
3. 3. The melting of glaciers is causing sea levels to rise.
   冰川的融化导致海平面上升。