Mr. Oishi is my best friend.

Ishikawa is my best friend.

Mr. Ishiyama is my best friend.

When the tidal range is large, the coastline changes significantly.

Fishing on the coast is difficult today because it's a neap range.

The concept of 'différance' in Derrida's philosophy indicates that the meaning of words is constantly changing.

When wealth inequality widens, the stability of the entire society is shaken.

In math class, the teacher explained the concept of relative complement.

The monarch butterfly is a butterfly with beautiful colors.

Tenma is my best friend.