The researchers mixed two concrete samples, one modern and one copying the Roman recipe.

研究人员混合了两种具体样品，一种是现代的，另一种是复制罗马配方的。

And then, eventually, I get an update about an initial DNA sample, which was a mixed sample from his car door handle when he went to a Hobby Lobby.

然后，最终，我得到了有关初始 DNA 样本的最新信息，这是他去爱好大厅时从他的车门把手上采集的混合样本。