A tautology refers to a logical formula that is always true, no matter what values are substituted.

The Indo-European languages are some of the most widely spoken in the world.

I have been to Qitaihe.

I would like to visit the Nile River once.

The Amazon River dolphin is known for its beautiful pink body.

The Shatt al-Arab is located between Iraq and Iran.

Yesterday, I checked the location of the Edogawa on an old map.

My name is Yasokawa.

By regularly checking the key performance indicators, you can understand the performance of the company and devise improvement measures.

He found a way to profit from a difficult situation like fishing at the bottom of a river.