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

Homo erectus played a significant role in the process of human evolution.

He proposed to her, who was of lower status than him, saying, 'In love, there is no upper or lower.'

She wiped the sweat off her forehead.

I have been to Philadelphia.

I was born and raised in Aioi.

He shortened the story and conveyed only the main points.

He is my first lover.

He is known as a fair judge.

I felt happy holding hands intimately with him.