translation.en: It's a terrible thing to spray DDT on cotton fields, but it's a really good thing to use to eliminate millions of cases of death due to malaria in a small village.
translation.zh: 在棉花田喷洒滴滴涕是可怕的事， 但好的一面是用它来 消灭小村庄疟疾导致的数百万死亡案例。