atom
US /ˈæt̬.əm/
UK /ˈæt̬.əm/
1.
原子
the basic unit of a chemical element, consisting of a nucleus and orbiting electrons
:
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Water is made up of hydrogen and oxygen atoms.
水由氢和氧原子组成。
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The smallest particle of an element is an atom.
元素的最小粒子是原子。