This chemical reaction is very dangerous.

Fundamental knowledge of mathematics is necessary for daily life.

The success of this project is a combination of many components.

This factory strictly controls the emission of hydrogen sulphide.

This reaction occurs through a chemical process.

It is important to learn the basic grammar of Japanese.

He is majoring in chemistry at university.

We had a picnic at the seashore on the weekend.

This cosmetic contains silicon.

He sued the company.