The history of the International Communist Party had a significant impact on world political history.

He joined the demonstration while humming The Internationale.

He is an expert in international relations.

This reaction occurs through a chemical process.

He is an excellent chemist who made many discoveries.

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.

We are growing vegetables without using chemical fertilizers.