Mr. Zhai is my best friend.

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

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

These glasses are made of polycarbonate.

He makes music using a vocoder.

Kōbō Daishi greatly developed Buddhism in Japan.

I like her boyish style.

He bought a new surfboard.

The children were enjoying kickball in the park.

My opponens pollicis muscle hurts.