He found the target and shot the arrow.

Personally, I think this movie is the best.

This stone is a mineral called clinozoisite.

He is majoring in mineralogy at university.

Mineral oil is often used in the manufacture of cosmetics and pharmaceuticals.

He called me back immediately after he hung up the phone.

My specialty is fiber optics.

He is an expert in fiber optics.

He is immersed in the study of geometrical optics.

It's difficult to understand the principles of electrooptics.