He is immersed in the study of panmagic squares.

This fish is completely farmed, and no capture is done in the natural environment.

When I hear that song, old memories come to mind.

This was truly an unexpected result.

I am surprised by this unexpected event.

His thoughts were as we expected.

He is an expert in ethology, and his research is highly regarded worldwide.

He is behaving like an idiot.

He likes to take a walk in the park at dusk.

He is a perfectionist, so he is very strict about his work.