Alaska's wealth in oil, natural gas,trees,fish and animal skins makes its purchase one of the greatest deals any country ever made for territory.

VOA: special.2010.02.11

When someone invented the airplane, before you knew it every country had an airplane because there was a best practice, there was a best technology and it was not unique to any one country.

有人发明了飞机,不知不觉,每个国家都有飞机了,因为这些最佳的设计,这些最好的技术,并不是一个国家所独有的

耶鲁公开课 - 金融市场课程节选