澳大利亚是世界上惟一独占一个大陆的国家。澳大利亚大陆早在5 0 0 0万年以前就同其它的大陆分离 ,四周的大洋阻碍了它同其他大陆的联系 ,形成了其独特的地理环境。封闭的环境、特有的物种使澳大利亚的生态系统成为世界上最为特殊的系统之一。人类稍有不慎就会破坏当地的生态平 Australia is the only country in the world to monopolize one continent. As early as 50 million years ago, the mainland of Australia separated from other continents. The surrounding ocean hindered its connection with other continents and formed its unique geographical environment. Enclosed environment and endemic species make Australia’s ecosystems one of the most unique systems in the world. A little human carelessness will destroy the local ecological level