Norms define how people " ought" to behave under particular circumstances in a particular society.

We conform ( 遵守) to norms so readily that we are hardly aware they exist

In fact, we are much more likely to notice departures from norms than conformity to them.

Smith touches on construction methods, the revolutionary invention of the automatic lift, the practicalities of living in the sky and the likelihood that, as cities become more crowded, apartment living will become the norm.

Compared with a hundred years ago, our lives are less tightly bound by social norms and physical constraints.

For example, men who endorse traditional masculine norms report lower relationship satisfaction, as do their female partners.