/ˈætəm/ n.1.【物】(quantity of element)原子A methane molecule is composed of one carbon atom attached to four hydrogens.1个甲烷分子由1个碳原子与4个氢原子构成。

2.【物】(as source of nuclear energy)原子3.(indivisible building block of theory)(作为理论基石的)原子, 元素4.(particle postulated by ancient philosophers)(古代哲学家认为构成物质的)假想微粒, 原子5.(minute fragment)微量；微粒smashed to atoms彻底击碎not an atom of truth没有丝毫真实可信之处