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

He is feeling solitude.

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

Ogura Hyakunin Isshu is one of the classical literatures of Japan.

He was anxious about starting a new business, but I encouraged him by saying, 'Even a journey of a thousand miles begins with a single step.'

World War I was a large-scale war that lasted from 1914 to 1918.

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

He tried to work hard and study at the same time, and in the end, he experienced the lesson of 'He who chases two hares catches neither.'