问题: 汉译英，求翻译
不要求直译，大概意思对就行，初三到高一水平，可以略作修改。
原文：
本片通过北极熊Nanu和海象Seela一生－－从出生到成年的发展历程，向观众呈现了一个美丽生动而又危机四伏的北极世界。但是由于全球气温的升高，北极的浮冰减少了２０％，动物们的生活随着日趋恶化的环境而改变。
解答:
This film describes the whole lives of a polar bear named Nanu and a walrus Seala. It shows a beautiful,lively but dangerous world in the Arctic to audiance by presneting the two characters' developing courses from their birth to growing up. However, because of global warming, ice floes have decreased by 20% in the Arctic and the animals' life is changing with the environmental deterioration.
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