The troposphere is a part of the Earth's atmosphere, extending from the surface to about 10 kilometers.

The launch of intercontinental ballistic missiles has become an international issue.

I studied Classical Chinese in university.

He is an expert in fluid mechanics.

His dynamic visual acuity as a baseball player is very excellent.

The Grand Duchy of Luxembourg is a small country in Europe.

He is preparing to explore the Dark Continent.

He is doing special exercises to strengthen the opponens digiti minimi muscle of his foot.

He underwent surgery due to an injury to the opponens digiti minimi muscle.

My opponens pollicis muscle hurts.