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

His sociability is an important factor for his success as a leader.

Changes in the social system inevitably occur with time.

Social justice means that all people are treated equally.

He used to be a member of the Chinese gang.

He experienced the harsh reality of the underbelly of society.

He always proactively suggests new ideas.

He likes to take a walk in the park at dusk.

The Calopteryx cornelia is a species endemic to Japan, and it has beautiful wings.

I am very interested in sociolinguistics.