Slowly the area became what visitors see today -- a dry land of high flat mesa tops and deep canyons formed through thousands of years by flowing rivers.

VOA: special.2010.07.05

And I think through philosophy, we can think about those issues and values in a deep way that can help us and others to find the way in which we can make a difference to the world.

通过哲学，我们能够进一步思考一些问题和价值观,它们能够帮助我们和他人,找到一种方式,来改变世界。

普林斯顿公开课 - 人性课程节选