Wood and coal for fuel. Technology solved many of the problems.

VOA: special.2010.04.15

I went to see a rich girl I knew. In the morning she pulled a hundred-dollar bill out of her silk stocking and said, "You've been talking of a trip to Frisco. That being the case, take this and go have your fun." So all of my problems were solved.

我去看望我以前认识的一位有钱的姑娘,到了早上，她从丝绸钱袋里取出一张100元的支票说：,“既然你那么向往到圣弗兰西斯科的旅行，拿着这个去寻找你的快乐吧“，这下我的问题全部解决了。

耶鲁公开课 - 1945年后的美国小说课程节选

And that makes it for me a very exciting time to study this because the problems aren't solved in the way that bridge building is largely a solved problem now.

对于我而言,这是一个非常激动人心的时代,因为一百年前桥梁建设中难以解决的问题,在今天都得到了解决

耶鲁公开课 - 生物医学工程探索课程节选