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importance
It is important to understand the importance of health.
healthy, healthy, hygienic, healthful
He exercises every day and leads a healthy life.
physical examination, medical examination
I am planning to have a physical examination next week.
an isotope
An isotope refers to elements with the same atomic number but different numbers of neutrons.
(chemistry) rare earth elements
Rare earth elements are essential materials for the manufacture of electronic devices.
a transition element
Transition elements play an important role in chemical reactions.
(chemistry) chemical element
Oxygen, which is one of the chemical elements, is necessary for us to breathe.
upper teeth
He is brushing his upper teeth.
lower teeth
He is brushing his lower teeth.
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