A nuclear submarine can travel underwater for a long time.

He is an expert in comparative linguistics.

Computational linguistics is the study of analyzing human language with computers.

I have been to Thuringia.

All his stories are thought to be lies.

He is trying to mend his relationship with his ex-wife.

He wrote the original plan for this movie.

I heard the sound of cicadas in the park.

The human immunodeficiency virus destroys the immune system, causing the body to lose its ability to fight disease.

The human immunodeficiency virus is the virus that causes AIDS.