He looks at the English vocabulary every day and learns new words.

He is learning Aymara, a language of South America.

His halo was so bright that I had to close my eyes.

I heard a dog's bark from nearby.

I could hear the dog's howling all night long.

I have been to Bogota.

Japanese clitics are important for understanding grammar.

He dedicated his life to God.

In this chemical reaction, condensation occurs.

He is known as a defender of the natural environment.