英 ['?t?m]
美 ['?t?m]
n.原子；微粒
Scientists have unlocked the secret of the atom.
科學家已經揭開了原子的秘密。
A molecule of water consists of two atoms of hydrogen and one atom of oxygen.
水分子含有兩個氫原子和壹個氧原子。
The atom bomb is the offspring of the 20th century physics.
原子彈是20世紀物理學的產物。