He is the lord of this region.

He feels responsible as the head of the family.

The Lord protects us.

What are you doing?

My biological clock is completely messed up.

The parasympathetic nervous system helps our body to relax and conserve energy.

He is a carnivorous man, being aggressive in relationships.

The human immunodeficiency virus destroys the immune system, making the body unable to fight disease.

It is important to learn about the prevention and treatment of the human immunodeficiency virus.

The police arrested him on suspicion of trespassing.