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

I spilled the powder in the kitchen.

Cell biology is the study of the structure and function of cells, which are the basic units of life.

Neuroanatomy is an important field of study for understanding the structure and function of the brain.

There are many chambers in this castle.

Moura goes to bed at 9 o'clock every day.

They were conspiring.

There is a large fire wall in front of the fire department.

By regularly checking the key performance indicators, you can understand the performance of the company and devise improvement measures.

Mr. Tsuzuno is an early riser.