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.

My family consists of eight people.

My friend came from China.

He lives in the central part of China.

My friend came from China.

He said he wanted to travel to the seven continents.