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And actually it's very, very reactive, molecular hydrogen and molecular oxygen.
实际上它是非常非常活泼的分子氢和分子氧。
Well we have molecular hydrogen and we have molecular oxygen.
好吧，我们有分子氢，我们有分子氧。
And molecular oxygen, once again, this is composed of two oxygen atoms. One, two.
分子氧，同样，它由两个氧原子组成。一二。
And this molecular oxygen, of course it's a molecule, but you would not call it a compound either.
而这个分子氧，当然它是一个分子，但你也不会称它为化合物。
人们对氧的同素异形体有着各种认知。其中最熟悉的是双氧(O2)，大量存在于地球大气层，也被称为分子氧或三线态氧。另一个是高活性的臭氧(O3)。其他包括：
There are several known allotropes of oxygen. The most familiar is molecular oxygen (O2), present at significant levels in Earth's atmosphere and also known as dioxygen or triplet oxygen. Another is the highly reactive ozone (O3). Others include:
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