He found a solution to the problem through a cycle of answering his own questions.

He found a solution by repeatedly answering his own questions.

He is a specialist in that field.

He studied under a famous painter.

The family crest of my house is Nantenmon.

My new coat hanger is very convenient.

He couldn't say anything about issues outside of his field of expertise.

I want to go to Montréal in France.

He is known as a disciple of Jesus.

There are many different specialty stores in this town.