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 is deeply interested in social issues.

He used to be a member of the Chinese gang.

He experienced the harsh reality of the underbelly of society.

There is a rare tree of Ubamegashi in this park.

The Ubame oak tree is a native species of Japan and is very beautiful.

Ishigyoubo is my best friend.