atom

US /ˈæt̬.əm/
UK /ˈæt̬.əm/
"atom" picture
1.

原子

the basic unit of a chemical element, consisting of a nucleus and orbiting electrons

:
Water is made up of hydrogen and oxygen atoms.
水由氢和氧原子组成。
The smallest particle of an element is an atom.
元素的最小粒子是原子
2.

丝毫, 一点

a tiny particle or amount of something

:
There isn't an atom of truth in what he said.
他所说的话没有一真实性。
She didn't show an atom of fear.
她没有表现出丝毫的恐惧