Sudden changes in moisture availability, plant or animal diversity or development can degrade and often destroy this fragile landscape.
湿度或动植物种类的突然变化以及人为开发都会削弱甚至破坏这片脆弱的地貌。
Diversity, not assimilation... and that the beaver is a truly proud and noble animal.
多元化，而不是同化…而且海狸是一种真正自豪和高贵的动物。
The tropics boast more than 10 times as many species of animal and plant as the Arctic, with diversity decreasing steadily as you approach the poles.
热带地区繁衍着比北极地带多上数十倍的动植物物种，地理位置越趋向两极，生物的物种就会有直线的减少趋势。
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