Jeffrey Olson says experts do not know what will take the place of the plants and animals that are lost, or how wildlife will survive in a changed environment.

VOA: special.2009.09.28

Bridges have really changed our society and allowed us to get from one place to another in ways that we couldn't have gotten to easily before.

桥梁改变了我们这个社会,使我们能够以前所未有便捷方式,从一个地方到达另一个地方

耶鲁公开课 - 生物医学工程探索课程节选

If an American, because his skin is dark, cannot eat lunch in a restaurant open to the public-- , then who among us would be content to have the color of his skin changed and stand in his place?

如果一个美国人，因为他的皮肤是黑色，而不能在一家对公众开放的餐馆吃午餐…,诸如此类的话，那么我们当中有谁会愿意,换上他的肤色，接受他受到的待遇？

耶鲁公开课 - 心理学导论课程节选