bystander effect

The bystander effect explains why individuals are less likely to help in emergencies when others are present.旁观者效应解释了为什么在紧急情况下，周围有其他人在场时，个人更不可能伸出援手。

Awareness of the bystander effect has informed training programmes for public safety.对旁观者效应的认识已被用于制定公共安全培训项目。