He is an expert in psychiatry.

This reaction has reached chemical equilibrium.

He is an expert in oenology and has a deep knowledge of wines from around the world.

He is majoring in history at university.

He is a world-famous scientist.

He is majoring in ethics at university.

I go to the local orchestra concert every weekend.

My dormitory is close to the campus.

I forgot my student ID card.

He is a renowned scientist who has made many discoveries.