The era of the Three Sovereigns and Five Emperors is an important period in Chinese history.

I have been to Congo-Kinshasa.

I live in the city of Montgomery.

I do laundry using synthetic detergent.

I learned Pythagoras' theorem at school.

He participated in the Olympics as a pentathlon athlete.

Pentathlon is a competition that tests both physical strength and technique.

The seasoned egg in this ramen is delicious, isn't it?

Tierra del Fuego is located at the southernmost tip of South America.

The development of fusion reactors could potentially be the key to solving future energy problems.