It is important to use mouthwash every day after brushing your teeth.

He couldn't answer the phone because of his absence.

This building is made of high-quality building stone.

He was entrusted with the receivership of the company.

The coexistence of humans and nature is important for the sustainability of the Earth.

Humans and nature should coexist.

This building is made of high-quality steel.

We are choosing building materials to build a new house.

This oil solution is used to reduce friction in machinery.

This mixture is used to alleviate the symptoms of a cold.