He conducted an experiment using a spherical lens.

The calculation of the spherical angle is a part of geometry.

He is suffering from poverty.

He is playing the character of Kyu in the play.

This is my salary.

What time does the next semi-express train come?

I recently met a middle school classmate of mine on the train.

He is an old acquaintance.

He was handed over to the international tribunal as a war criminal.

This museum exhibits a collection of rare ulexite.