The idea really took root--the idea, the intuitive idea is that as you write a large number of policies, the fraction that will result in accidents becomes closer and closer to the probability of one accident.

这种观点建立在...,观点是,只要你签的保单足够多,事故占保单总数的比例就会越来越接近,事故发生的概率

耶鲁公开课 - 金融市场课程节选

If you had one negative number in it, then the product would be a negative number and, if you took a root of that, then you might get an imaginary number.

如果这当中有一个负数,乘积就会变成负的,如果你对一个负数开根号,你就会得到一个虚数

耶鲁公开课 - 金融市场课程节选