What if you're talking about a group of people that don't have any cows in their vicinity, let alone a sick cow?

万一你遇到一群人,他们附近连头奶牛都没有,更不用说受病毒感染的奶牛

耶鲁公开课 - 生物医学工程探索课程节选

All the sick people will come to you to buy life insurance and they will turn out to have a higher death rate than the population at large.

所有生病的人都会向你购买人寿险,而他们比普通人群,有着更高的死亡率

耶鲁公开课 - 金融市场课程节选