His success was not only due to his own efforts, but also involved machinations.

I cleaned the garden with a bamboo broom.

He overate and drank too much due to stress.

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

I can't find my Allen key.

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.