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1·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.

这里我的旨趣不在动机的心理学方面，我不准备去论证人们在做出利他行为时，是否“真的”私下或下意识地抱有自私的动机。

4·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.

这里我的旨趣不在动机的心理学方面，我不准备去论证人们在做出利他行为时，是否“真的”私下或下意识地抱有自私的动机。