No one knows what made the Germanic language branch off from the Indo-European family.
无人知晓什么原因导致了日耳曼语从印欧语系中脱离。
2
English is a language branch belonging to the West Germanic line of the Indo-European family.
英语是西日耳曼语系的一个分支。西日耳曼语系属于印欧语族。
3
English belongs to the west Germanic branch of the Germanic sub-family, which in turn is a member of Indo-European family, the largest one in the world.