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(crystallography) crystal class
The study of crystal classes is an important part of mineralogy.
mineralogy
He is majoring in mineralogy at university.
minerals
This area is known for producing a variety of minerals.
part, section, segment, portion
It's difficult to solve a part of this problem.
important, significant
Health is very important.
importance, consequence, significance
His opinion is very important.
a piece of research, a study, investigation
He is conducting research on a new energy source.
to research, to study
He is researching about a new energy source.
clear / crystal / diamond
Akira is always clear-minded and liked by people.
a unisex given name
Akira is my best friend.
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