heavy water

heavy-water的词性：
n.（名词）

1. Any of several isotopic forms of water, especially deuterium oxide, that consists chiefly of molecules containing heavy hydrogen and is used as a moderator in certain nuclear reactors.
重水：几种水的同位素形式之一，尤指氧化氘（氘水），它主要由含有重氢的分子组成，在某些核反应堆中被用作催化剂