英语听力：自然百科 北极熊 冰上间谍 Spy_Bear—18

Calcium from the bones will help the mother's milk supply, but the cub needs meat to survive. Now they have another problem. Other bears can't be trusted with small cubs. But fortunately they seem more interested in what lies beneath the surface. It

发表于:2018-12-03 / 阅读(82) / 评论(0) 分类 自然百科2010年

英语听力：自然百科 北极熊 冰上间谍 Spy_Bear—19

Finally she leaves him some scraps to chew on. A young male arrives, a dangerous situation for the cub. She growls a warning. Its not enough. The cub slips. The mother must get her cub away from danger as quickly as possible. They head north. She kno

发表于:2018-12-03 / 阅读(64) / 评论(0) 分类 自然百科2010年

英语听力：自然百科 北极熊 冰上间谍 Spy_Bear—20

The mother and cub are thrown a lifeline by a change in the weather and ocean currents. It is a huge swim out to the ice floes for the little cub. He finally makes it to the ice, nine months after he was born. His mother has triumphed against the odd

发表于:2018-12-03 / 阅读(100) / 评论(0) 分类 自然百科2010年

英语听力：自然百科 北极熊 冰上间谍 Spy_Bear—21

Blizzardcam nearly met its match with the most playful bear it's ever encountered. The bear wanted to know how it worked. Blizzardcam deployed snowballcam as a decoy. This was the polar bears' favorite spy camera and this young male was no exception.

发表于:2018-12-03 / 阅读(73) / 评论(0) 分类 自然百科2010年

英语听力：自然百科 野性俄罗斯之西伯利亚 Siberia—1

Russia, inaccessible to the rest of the world for so long. Now open borders spill its secrets. In its heart lies a place of surprises, Siberia. Not only a frozen wilderness, it is a region of incredible diversity, of precarious beauty and endangered

发表于:2018-12-03 / 阅读(87) / 评论(0) 分类 自然百科2010年

英语听力：自然百科 野性俄罗斯之西伯利亚 Siberia—2

They disturb a falcon, which in turn disturbs the ravens. Apparently Siberia's 13 million square kilometers still isn't enough space. Howling, the wolf call to arms, gathers the pack and warns other wolves to back off. The chorus can carry for 10 kil

发表于:2018-12-03 / 阅读(64) / 评论(0) 分类 自然百科2010年
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