However, the other comets analyzed so far, have twice the amount of HDO, or heavy water, that's in our oceans.

但是目前分析的其他彗星的水重水比例是地球水的两倍。

We know the Earth's oceans contain a mixture of normal water, H2O, and heavy water, HDO, which includes deuterium, a form of hydrogen that is twice as heavy as normal hydrogen.

我们知道海洋中拥有地球上水的混合物水(氧化氢)与重水(氧化氘)含有氘一种氢的同位素，为氢质量的两倍。