norm

在公共场所使用智能手机已成为一种社会规范。

It has become a societal ___norm to use smartphones in public places.

在许多地方，见面时握手是一种社会规范。

In many places, it's a social ___norm to shake hands when you meet someone.

在这个国家，排队等候是一种社会规范。

In this country, queuing is a social ___norm.