He is working as a doctor in the Japan Self-Defense Forces.

He went to a clinic for semen collection.

He works collecting semen from cows.

He is working at the hospital as a resident.

He was a feudal clan doctor in the Edo period.

He is a world-renowned scholar.

He is a renowned jurist who has written many important legal books.

He is a world-famous mathematician.

He is known as a government scholar.

Projective geometry is a branch of mathematics that studies geometric objects such as points, lines, and planes and their relationships.