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chemical engineering
My major is chemical engineering.
analytical chemistry
Analytical chemistry is a science that reveals the composition and structure of substances.
physical chemistry
I am majoring in physical chemistry at university.
chemical pollution
Chemical pollution has a serious impact on the health of the Earth.
chemical
This reaction occurs through a chemical process.
a chemist
He is an excellent chemist who made many discoveries.
petrochemistry
He is an expert in petrochemistry.
chemical analysis
He is an expert in chemical analysis.
chemical equation
It's difficult to decipher this chemical equation.
Understanding chemical equations is difficult.
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