The impression from that sight left a deep mark on his heart.

He always proactively suggests new ideas.

The 16-cell is one of the convex regular polytopes in four dimensions.

In set theory, the symmetric difference indicates the difference between two sets.

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

He played a perfect fifth scale on the piano.

What is this object?

He is conducting research on celestial bodies.

This antibody strengthens the defense against the virus.

We should respect the opinion of the whole.