any of the people from whom sb is descended, especially those more remote than his grandparents; forefather
early form of a machine or structure which later became more developed; forerunner
St. Peter..the spiritual ancestor of the Bishop of Rome.
出自： H. H. Milman
It is believed that his [the Suffolk's] ancestors were the horses of the Norsemen.
出自： M. C. Self
In the rites of ancestor worship the child imitated the gestures of his grandfather.
出自： F. Fitzgerald