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

His and her opinions ended up in a six of one, half a dozen of the other argument.

He is writing a thesis on dialectical materialism.

He cautioned not to speak ill of others, saying, 'Illness enters by the mouth, and disaster does not come out of it.'

This ancient proverb, 'know the other side and yourself, and you will not be in danger in a hundred battles', teaches us the importance of understanding ourselves and others.