The male polar bear's ice world has finally vanished beneath him. 冰雪世界最后在雄北极熊的脚下消失了
This is a disaster for polar bears. 对于北极熊而言 这是一场灾难
The ice is becoming too weak to support a male polar bear. 冰面开始变薄 已经很难承受一只雄性北极熊的重量
The polar bear cubs emerge from the den in which they were born. 小北极熊从洞穴中探出头来
The south polar skua is a formidable opportunist. 南极贼鸥是可怕的机会主义者
When the first polar explorers headed south, 第一批极地探险家前往南方时候