但我并没有因为这点而感到抱歉，因为大哭一场之后，我总是感到洁净了，就像我的心和头脑刚在洗热水澡时相互搓了背。

But I'm not going to apologize for that, because after a good cry, I always feel cleansed, like my heart and mind just rubbed each other's backs in a warm bath.

youdao

第二种形式是互惠的利他主义，或者说“你帮我搓背我也帮你搓背”。

The second form is reciprocal altruism, or "you scratch my back and I'll scratch yours".

youdao