Now, there's nothing special about annual-- that's the time it take the Earth to go around the sun, but it doesn't have any relevance to finance-- but we are just accustomed to using that.

这里所谓的一年也没什么特别,就是地球绕太阳一圈的时间,和金融没什么关系,我们只是习惯这么用

耶鲁公开课 - 金融市场课程节选