ancestors
n. [生物]祖先，上代；先祖（ancestor 复数形式）
例句
His ancestors had come to America from Ireland.
他的祖先从爱尔兰来到美国。
《牛津词典》
There was Greek blood in his veins: his ancestors originally bore the name Karajannis.
他有希腊血统——他的祖先原来姓卡拉扬尼斯。
《柯林斯英汉双解大词典》
Logic dictates that our ancestors could not have held a yearly festival until they figured what a year was.
依照逻辑推论，我们的祖先在弄清1年是什么意思之前，不可能举行过每年一度的节庆。
