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.

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

My cat has been infected with the feline immunodeficiency virus.

His Japanese ability is improving gradually.

Mr. Danno is a mathematics teacher.

He is suffering from acquired immune deficiency syndrome (AIDS).

She dyed her hair blue.

Their home is always filled with amiability, to the point where everyone envies them.