The Arctic is an ocean covered with drifting packed ice and hemmed in by the land masses of Europe, Asia, and North America.

北极是一片海洋，为漂流的冰块所覆盖，四周被欧洲，亚洲和北美洲所包围。

youdao

Lately, the mercury has crawled up into the 40s, turning hard-packed ice into an endless brown sea of mud.

NPR: Spring a Season of Dread for Troops in Afghanistan

Even at a distance, the brilliant blue of packed ice glimmers.

FORBES: Go with the Floe

There's nothing wrong with that when it's been packed in ice.

BBC: Mislabelled fish slip into Europe's menus