几个世纪以来纸张一直是人类知识的载体,我们的责任是确保它再延续几个世纪。#
Paper has been the carrier of human knowledge for centuries. Our duty is to ensure it continues for centuries more.
Development economics is ultimately about improving people's lives.
缺乏一个强大的国家对自由的威胁比存在一个强大的国家更大。