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

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

He is exactly in the state of 'A frog in a well does not know the vast ocean.'

He was swimming freely as if he was a fish playing in the pot.

We have equipped everything necessary for the trip.

This wire is bent into a hook shape.

His words can be understood as a metaphor.

He was captured by the enemy.

He was deeply grieving the death of his family.

My collection is finally complete.