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

Chrysophyta perform photosynthesis underwater, supplying oxygen.

Zhenzong was a great emperor of China.

Please open this opaque sliding door and take a look at the room.

Mr. Okuda is an insurance sales representative.

The center of this plate is sunken.

Please teach me how to calculate the area of this circular sector.

He felt nauseous and rushed to the toilet.

Three countries formed an alliance.