If neighbors are strangers to one another, they are less likely to sweep the sidewalk of an elderly couple living next door or keep an eye out for young trouble makers.

如果邻居彼此都是陌生人，他们就不太可能打扫住在隔壁的老年夫妇门前的人行道，也不太可能留意到一些捣乱的年轻人。