thick ice

基本解释

These remarkable pictures show how beluga whales help human visitors to swim under the thick ice.
以下这些不平常的图片展示了白鲸帮助人类访客在厚冰层下游泳的情景。
Not long after setting off, Eliyah spots a grey seal resting on some thick ice. He stops the boat and Tommy jumps out.
出发后不久，艾里亚就看见一头灰色的海豹在一块厚冰上休憩，他停下船来，汤米跃身跳出船去。
However, the old, thick ice that moved into this region is now beginning to melt out, which could further deplete the Arctic’s remaining store of old, thick ice.
然而，现在这些流入该地区的常年厚冰却开始融化，这可能会进一步消耗北极剩余常年厚冰的储存量。

Submarine crews practice surfacing the 8, 000-ton submarines, directly through thick ice or in nearby open waters, and learn to avoid hitting another ship.
FORBES: U.S. Navy Scrambles for Piece of Arctic Pie
That's a lot for a boat that might sit in the shed for years at a time, waiting for the right conditions of smooth, thick ice.
FORBES: Shiver Me Timbers