The human immunodeficiency virus is the virus that causes AIDS.

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

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.'

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

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

His success is an example of the proverb 'one general achieves success at the cost of ten thousand bones'.

The single point of red in the sea of green in the park was her red dress.

The encounter with him can be said to be 'the events of today are destined by the past.'

He achieved great success in his business, but as the proverb 'A thousand gold pieces' fur is not from one fox's armpit' suggests, it was not something he obtained overnight.

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.'