There were other people around. Someone else would help," but we know by looking at it that this difference makes a real difference.

我身边还有其他人，他们会帮他的”,但如果我们细究起来,会发现这种差别能产生重大影响。

耶鲁公开课 - 心理学导论课程节选

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