He is a world-renowned ichthyologist.

Life is a series of vicissitudes.

The Earthquake Early Warning went off on my cell phone.

He arrived in Tokyo yesterday.

Did you hear his voice?

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

He has morally degenerated.

He jumped as if he was dancing in mid-air.

He blushed with shame.

I always eat lunch in the park during the daytime.