This world is ruled by the law of the jungle.

She is conducting research on the world's oldest profession.

It is believed that black dwarfs are formed by the cooling of white dwarfs.

His attitude was solemn, and everyone felt a sense of respect.

He touched her hand.

I eat breakfast every day.

Rabbits are herbivores and mainly eat grass.

My friend is working in the United Arab Emirates.

The Federal Republic of Yugoslavia was once an existing nation.

The United Kingdom of Great Britain and Northern Ireland is a country located in Europe.