Cycloolefins play an important role in organic chemistry.

This pond expresses the diversity of life like a microcosm.

My cat has been infected with the feline immunodeficiency virus.

My coat is in the cloakroom.

In my new project, I am using a microcomputer.

I enjoyed the beautiful rural scenery while walking along the ridge.

His grandfather died of Creutzfeldt-Jakob disease.

Chlorofluoromethane is one of the substances that contribute to the destruction of the ozone layer.

This mutetrahedron plays a very important role in the world of mathematics.

This mutetrahedron has a very unusual shape.