The researchers also did brain scans of those who behaved most altruistically, before and after training.

在训练前后，研究人员分别扫描了那些表现得最无私的受试者的大脑。

So we had to somehow recruit and activate millions of citizens in dozens of countries to put pressure on their leaders to behave altruistically.

所以我们需要以某种方式 招募和激励这数百万的 来自几十个国家的公民 让他们向领导人施压 使他们更为无私。