That issue is irrelevant to our discussion.

His opinion is irrelevant to this issue.

They built a deep emotional bond before they had a physical relationship.

He is an expert in international relations.

In Marxism, it is said that the relations of production form the foundation of society.

He understands the importance of learning.

He is majoring in psychology.

Gaku is my best friend.

He has a deep interest in archaeology.

The Soviet Socialist Republics Union was a country that once existed.