He is deeply interested in social issues.

He deeply believes in the principles of socialism.

Maintaining social order is the responsibility of all of us.

He understands his responsibilities as a working adult.

After graduating from university, you have to prepare to enter the real world.

He is a fervent communist.

Polygyny is a social system where one man marries multiple women.

Monogamy is a system where one man marries only one woman.

Japanese politics adopts a bicameral system.

The United States has adopted a bicameral system.