That proposal is completely unthinkable.

As a practical question, how are we going to fund this project?

This bacteria multiplies exponentially.

Changes in the social system inevitably occur with time.

Social justice means that all people are treated equally.

He is an expert in sociology.

Actions that go against social norms are not allowed.

We should think deeply about the reform of the social security system.

He used to be a member of the Chinese gang.

He experienced the harsh reality of the underbelly of society.