1·Polar bears need the ice.
北极熊需要冰。
2·Polar bears are in great danger.
北极熊处于极度危险之中。
3·Polar bears like hunting for seals to eat.
北极熊喜欢捕食海豹。
4·They have pushed down the number of polar bears and seals while polar bears depend on sea ice for hunting seals.
它们导致了北极熊和海豹数量的减少，而北极熊依靠海冰捕食海豹。
5·Polar bears catch seals to eat on the ice.
北极熊在冰上捉海豹吃。
6·The Arctic is the home to about 25,000 polar bears.
北极是约两万五千只北极熊的家园。
7·Let's take action to protect our earth and save polar bears.
让我们采取行动来保护我们的地球，拯救北极熊。
8·Some polar bears, however, haven't been able to get enough to eat.
然而，一些北极熊没能有足够的食物。
9·Scientists fly in a helicopter, over the places where polar bears live.
科学家们乘坐直升飞机，飞过北极熊的栖息地上空。
10·It's reported that polar bears are in danger because of global warming.
据报道，由于全球变暖，北极熊正处于危险之中。