His popularity spread across the country in an instant.

His popularity increased in the blink of an eye.

The train will arrive soon.

He is suffering from combat stress reaction.

Neurotransmitters are responsible for transmitting information between nerve cells.

Sufficient caution is necessary when handling radioactive materials.

The concept of chemical equivalent is essential for understanding chemical reactions.

My company specializes in the manufacture of fine chemicals.

Stoichiometry is a method for calculating the amount of substances in a chemical reaction.

No chemical flavoring is used in this ramen at all.