Oil, bonds, and stocks are all independent-- somewhat independent--they're not perfectly independent, but they're somewhat independent and, to the extent that they are, it lowers the variance.

石油，债券和股票都是互相独立-,一定程度上独立，不是绝对的独立，但一定程度上独立，可以使方差值变小，降低风险。

耶鲁公开课 - 金融市场课程节选

One of the powers of a group then is it diminishes responsibility.

群体的一个力量就是,使责任变小。

耶鲁公开课 - 心理学导论课程节选