He is a world-renowned biologist.

We conducted a spectral analysis to investigate the spectral characteristics of this substance.

This shape is called a muoctahedron, in other words, a hexagonal four-piece square hole twisted polyhedron.

Him calling me lazy is truly a case of the pot calling the kettle black.

The feline immunodeficiency virus can potentially have serious effects on a cat's health.

My cat has been infected with the feline immunodeficiency virus.

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.

He left early to avoid the problem.

This work is almost finished.