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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.
widely known, well-known, well connected
He is widely known in this town.
(literally, their heart is wide) generous, big-hearted
He is a person with a broad mind, so he is liked by everyone.
a male given name
Kenhiro is my best friend.
Mitsuhiro is my best friend.
Tokuhiro is my best friend.
Yuhiro is my best friend.
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