What I'm going to do is, I'm going to explain to you an extreme green concept that was developed at NASA's Glenn Research Center But before I do that, we have to go over the definition of what green is, 'cause a lot of us have a different definition of it.
我将向大家介绍一种极其绿色的理念， 这一理念是在俄亥俄州克利夫兰的 美国航空航天局格伦研究中心形成的 在介绍之前，先让我们来回顾一下 绿色环保的定义 因为很多人都有不同的理解