Primitive communism is one of the initial forms of human social organization.

I live in San Diego.

It's difficult to hit a trifecta.

He made a model of a triangular prism.

At the end of the meeting, we concluded with a ceremonial hand clapping, called 'Sanbon-jime'.

Oleum is a very dangerous chemical, and it requires great caution when handling.

Please throw the leftover food in the triangular sink basket in the kitchen.

Sodium carbonate is often used in the manufacture of detergents and glass.

Carbonate of soda is a versatile substance that can be used for laundry and cleaning.

I made an appointment at the department of obstetrics and gynecology for tomorrow.