He is an expert in international law.

He is a specialist in that field.

This conference will be held on an international scale.

This issue is against our national law.

He thoroughly researched the history of that nation.

He started singing The Internationale.

He is interested in learning the international language.

His specialty is physics.

I first met her on the occasion of a friend's wedding.

When he returned to his country, we saw him off at the airport.