I studied in the library with my schoolmate.

This compound has a tetrahedral molecular geometry.

My major is chemical engineering.

The Ministry of Education is responsible for Japan's educational policy.

My father is an expert in otolaryngology.

That theory is unscientific and has no evidence at all.

He is an expert in computer science.

This road is made of crushed stone.

The task of breaking a large rock down to the desired size is very difficult.

It was the first time I sat with him.