He learned the basics of Japanese.

He chose euthanasia to be freed from the pain of his illness.

He died from overwork.

Yoroshiku, please do your best to pass the exam tomorrow.

He decided to apply euthanasia to his sick dog.

The deathwatch beetle is known for eating wood.

This contract prohibits interference by a third party.

The Neogene period is a part of the geological era, which lasted from about 23 million years ago to about 2.6 million years ago.

The Paleogene period was a very important time in the history of the Earth.

The Quaternary is the most recent era in Earth's history.