translation.en: But if you took this 30 percent, these 300 people and had them nominate their friends and took the same number of vaccine doses and vaccinated the friends of the 300 -- the 300 friends -- you can get the same level of herd immunity as if you had vaccinated 96 percent of the population at a much greater efficiency, with a strict budget constraint.
translation.zh: 但是如果你选择百分之三十的这三百人， 让他们举出他们的朋友 然后使用同样数量的免疫针 使得这三百人的朋友免疫， 这三百个朋友， 你就能达到群体免疫的效果 就好像给百分之九十六的人打预防针的效果一样 同时效率更高，并且花费更少。