He said, 'The advantages of heaven and earth are nothing compared to the harmony among people,' emphasizing the importance of teamwork.

I happened to meet him at the park.

Saito is my best friend.

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

He is feeling solitude.

Hitori is my best friend.

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

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 pointed to the location on the map with his index finger.