An unexpectedly large fraction of players acted altruistically to protect their weaker friends.

远远超出人们的预料,有很大一部分玩家在游戏中无私地保护那些弱者朋友.

When someone acts altruistically, they are acting on the basis that it is the right thing to do not because they feel bad.

当某人有利他行为时，他们会基于‘因为感到难过，所以这么做是正确的’这种想法而行动。

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。