属一群拥有共同祖先和明显特征的有机体，尤指属于同一物种的一群，通过人工选择来发展，通过有控制的繁殖来维持 A group of organisms having common ancestors and certain distinguishable characteristics, especially a group within a species developed by artificial selection and maintained by controlled propagation.
他的祖先来到英国的时候是难民。 His ancestors had come to England as refugees.
据说我们的祖先是猴子。 It is said that our progenitors are monkeys.
他的祖先之一是美洲的早期移民。 One of his forefathers was an early settler in America.
