He is spending a lot of time on experimental research.

He is conducting research on a new energy source.

He is researching about a new energy source.

He is known as a person with learning.

He found the target and shot the arrow.

Personally, I think this movie is the best.

He is interested in geometrical shapes.

Cartilaginous fishes do not have bones, instead their bodies are supported by cartilage.

My father is an ichthyologist and has a deep knowledge about marine life.

He always supports my opinion.