He is often thought to be an unfriendly person.

This company has decided not to pay dividends again this year.

He is infected with the coronavirus, but he is asymptomatic.

He understands the meaning of the proverb 'Teaching is half learning', which means that teaching leads to one's own learning.

It has been a while.

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

My company specializes in the manufacture of fine chemicals.

Chemotransmitters play an important role in the transmission of information between nerve cells.

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

No chemical flavoring is used in this ramen at all.