dioxygenWiktionary 原文构词拆分di-前缀Two. · Double, twice the quantity.+oxygen词根/词干词源说明From di- + oxygen.释义（英文）名词 Noun(inorganic chemistry) Diatomic oxygen: the normal allotrope of oxygen, having two atoms per molecule.(inorganic chemistry, in combination) Two atoms of oxygen in a molecule.词族派生词（4）dioxygen difluoridedioxygen hexafluoroplatinate