a person, typically one more remote than a grandparent, from whom one is descended
祖先
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he could trace his ancestors back to James the First .他可以把先祖追溯到詹姆斯一世。
an early type of animal or plant from which others have evolved
(动植物的)原种。
an early version of a machine, artefact, system, etc., which later became more developed
(机械、人工制品或制度等的)原型。
"Middle English: from Old French