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organic chemistry
I love organic chemistry classes.
(chemistry) a chemical reaction
This chemical reaction is very dangerous.
immunochemistry
He is dedicated to the study of immunochemistry.
thermochemistry
Thermochemistry is a part of chemistry that deals with the reactions of heat and matter.
chemical pollution
Chemical pollution has a serious impact on the health of the Earth.
chemical fiber
This shirt is made of chemical fiber.
(rare) the first day of the month
The first day of the month is the beginning of a new month.
once; one time
I have been to France once.
first, foremost, number one
His first choice of school is the University of Tokyo.
one person / singleness, singularity / one's own efforts or strengths / an unmarried person, single
I went to see a movie by myself.
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