Aluminium oxide is widely used as a refractory and abrasive material.

Calcium oxide is one of the main components of cement.

Peroxidation is one of the chemical reactions, especially involved in the oxidation of lipids.

He suddenly stood up and left the room.

I maintain my health by doing aerobic exercises every day.

Radioactive elements are produced in nature and scientific experiments.

In the traditional Japanese number system, Nahyuta represents a very large number.

He went to the doctor complaining of objective symptoms.

Carbon dioxide is one of the main causes of global warming.

Hydrogen peroxide is often used for disinfecting wounds.