I can't see an end to the argument with him.

He is supporting that theory.

We gathered to discuss that issue.

We use encryption to protect important data.

We need to encrypt important data.

I am interested in investing in cryptocurrency.

He has expert knowledge.

He is studying computer science at a specialized school.

He is a specialist fool, with no interest in anything outside his field.

He couldn't say anything about issues outside of his field of expertise.