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(chemistry) rare earth elements
Rare earth elements are essential materials for the manufacture of electronic devices.
rare earth
Rare earth is an essential material for the manufacture of electronic devices.
europium
Europium is one of the rare earth elements.
one thing
He ate one apple.
(chemistry) element, chemical element
Hydrogen is the most abundant element in the universe.
first, initial / one-eyed
This is my first question.
an isotope
An isotope refers to elements with the same atomic number but different numbers of neutrons.
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.
one-eyed goblin, a Japanese monster
The one-eyed goblin was dancing in the forest.
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