Provisions available in local shops have to be flown into Nunavut on one of the most costly air networks in the world, or brought by supply ship during the few ice-free weeks of summer.

当地商店里的供应品必须通过世界上最贵的航空网路之一空运到努勒维特，或者在夏季中少数几个无冰周里通过补给船来购买。

youdao

He persuasively argued that such an ice-free corridor did not exist until much later, when the continental ice began its final retreat.

他很有说服力地指出，直到很久以后，当大陆上的冰开始最后消退时，才有了这样一条没有冰的走廊。

youdao

Evidence that an ice-free corridor between two ice sheets developed when the continental ice first began to melt came primarily from radiocarbon dating.

当大陆上的冰开始融化时，两块冰原之间形成了一条无冰走廊，这一证据主要来自放射性碳测年法。

youdao

Polar bears in the southern latitudes have been accustomed to ice-free summers since well before the Industrial Revolution.

WSJ: Are Polar Bears Really Disappearing?

We were there in early March, and the harbor was ice-free, which is also very unusual for that region.

NPR: Oceanographer Sees Real Effects of Climate Change

During the ice-free seasons on the Great Lakes, ships competed with railroads, so Chicago had the cheapest rates to the East.

FORBES: Wisconsin Republicans Attack a Brilliant UW Historian