My father cultivates sugar beets.

His body showed a rejection reaction to the transplanted organ.

She overreacted to his words.

His single word triggered a chain reaction, and everything changed.

Nuclear reactions are used for mass production of energy.

I was surprised by his overreaction.

He is an expert in petrochemistry.

It's difficult to decipher this chemical equation.

Understanding chemical equations is difficult.

He is an expert in chemical analysis.