I majored in something called geographical information systems and applied it to archeology.

我主修一个叫做地理信息系统的东西，并将其应用于考古学。

Because I didn't know exactly what I wanted to do, I majored in something I was very interested in.

因为我不知道自己到底想做什么， 所以我主修了一些我很感兴趣的东西。