I doubt that we are altruistically concerned for our peers' wellbeing.
我并不相信我们真是无私的关心着他人的健康。
2
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。
3
I am not concerned here with the psychology of motives. I am not going to argue about whether people who behave altruistically are "really" doing it for secret or subconscious selfish motives.