The march of invention has clothed mankind with powers of which a century ago the boldest imagination could not have dreamt.
Every tree we plant today is a legacy for generations we'll never meet.
自然和历史是地理知识的两个重要来源。
There is no better teacher than history in determining the future……There are answers worth billions of dollars in a history book.
成功的衡量标准不仅仅是利润，还有我们对世界的积极影响。