translation.en: Written in our DNA, in our genetic code -- we have a historical document that takes us back in time to the very earliest days of our species. And that's what we study.
translation.zh: 信息都记在我们的DNA里，在我们的基因书中。 就像一本历史长卷，把我们带回过去， 带到我们人种最早的年代去。这就是我们要研究的。