Because sloth bears are smaller than brown and polar bears and are under greater threat from dangerous animals, they may have adopted the extra precaution of carrying their cubs.

因为树懒的体型比棕熊和北极熊要小，而且面临着更大的来自危险动物的威胁，所以它们可能会带着幼仔采取额外的预防措施。

youdao

As a result, many animals are dying out, such as penguins and polar bears.

因此，许多动物正在灭绝，比如企鹅和北极熊。

youdao

I'm back in Finland with the snow, reindeers, and polar bears.

我回到了芬兰，那里有雪、驯鹿和北极熊。

youdao

He was inspired when visiting a remote Inuit community in Northern Canada, and now wants to share his experiences of seeing polar bears and the Arctic.

VOA: standard.2009.12.13

MEPs on the European Parliament's Environment Committee have tabled a motion calling for a ban on trade in blue fin tuna and polar bears.

BBC: Endangered species debate

This follows the movements of tagged elephants, whales and polar bears.

BBC: Love Earth

Esquimau igloos and polar bears and the beautiful Northern lights.

NPR: Excerpt: 'The Member of the Wedding'