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comparative linguist
He is world-famous as a comparative linguist.
underground nuclear test
It is reported that North Korea has conducted another underground nuclear test.
experimental psychology
He is an expert in experimental psychology.
experimental study
He is spending a lot of time on experimental research.
an alkaline earth metal
Alkaline earth metals are located in Group 2 of the periodic table.
subcritical nuclear experiment
He is known as an expert in subcritical nuclear experiments.
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