We'd been led to believe that we would encounter a good proportion of this older, thicker, technically multi-year ice that's been around for a few years and just gets thicker and thicker.

我们被误导会遇到相当一部分年代更久远的、更厚的，并且需要多年才能形成的冰，这些冰已经存在了好几年并且变得越来越厚。