In addition, several more groups (including Anatolian, Tocharian, Phrygian, Thracian, Illyrian, etc) have since died out completely, and yet others may have existed which have not even left a trace.

此外，还有几个族群（包括 Anatolian、Tocharian、Phrygian、Thracian、Illyrian 等）已经完全消亡，还有一些可能存在，甚至没有留下任何痕迹。