He underwent surgery on his testicle.

This 正數 is the same as what I learned in school.

His voice quality is very attractive.

This meeting is very formal, so please dress appropriately.

He is deeply interested in the spiritual world.

I clean my room every day.

Political struggles often hinder the progress of a country.

A positive number is a number greater than zero.

I was moved by his sincerity.

I feel the passage of time.