Right now the total value of single-family homes in the United States is about twenty trillion dollars and the market has been becoming increasingly speculative.

如今,美国家庭的,房产总值,接近2万亿美金,而且,市场变得越来越投机

耶鲁公开课 - 金融市场课程节选

This was a very--a single experiment done within the United States, but the idea is appealing, that people are connected to one another via chains of people.

这个实验是在美国做的，但它揭示了一个很有趣的规律，人都是通过一连串的人和另一个人有着某种关联。

耶鲁公开课 - 心理学导论课程节选