听一分钟英文：Sustainable Development-可持续发展

Sustainable development is one of the buzz words of the new century. Almost everything we do nowadays we have to think about sustainable development. It is incredibly important. It’s a concept at the heart of the Earth’s survival. It’s not rocket science. There are so many people on Earth and so many resources. If there are too many people, there won’t be enough resources to sustain us – to provide us with food, water, shelter and other basics. Experts are trying to figure out how we can develop and sustain the human population. This is tricky¹. Anyone can see this is difficult. How can there be enough water, farmland, trees and raw materials for us to maintain our luxury lives? We can’t.

1 tricky   

adj.狡猾的，奸诈的；(工作等)棘手的，微妙的

参考例句：

• I'm in a rather tricky position.Can you help me out?我的处境很棘手，你能帮我吗？
• He avoided this tricky question and talked in generalities.他回避了这个非常微妙的问题，只做了个笼统的表述。