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chemistry (branch of natural science)
He is an expert in chemistry.
use one thing for many purposes / work someone hard
He is using that coat from winter to spring.
distilled water
I use distilled water for the experiment.
to use one's head
You need to use your head to solve this problem.
test results
These test results are showing unexpected outcomes.
experimental group
We analyzed the data of the experimental group.
empirical science
He has a deep interest in empirical science.
experimenter; researcher
The experimenter analyzed the data in detail.
experiments on animals
Animal experiments are necessary for the advancement of science, but there are also ethical issues.
nuclear test
Nuclear tests pose a great threat to world peace.
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