They're done with the standard university undergraduates like you and these-- and if you were in this group you wouldn't say, "Oh. I didn't want to help because the person's black."

而是普通大学的本科生,像你们一样-,如果你属于这个群体，你不会说，”我不想帮他，因为这个人是黑人“

耶鲁公开课 - 心理学导论课程节选

My group members don't want to help.

我的小组成员都不愿意帮忙。

I'd rather 实战 - SpeakingMax英语口语达人

If there's a group, responsibility to help decreases and this is captured in different ways but the main idea is we all think someone else will help so we don't. There's a diffusion.

如果是一群人，帮助的责任就会分散变小,这体现在多个方面,但最主要的想法就是我们都认为别人会帮助,所以我们就不帮助了，责任被分散了。

耶鲁公开课 - 心理学导论课程节选