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1·His ancestors had come to America from Ireland.

他的祖先从爱尔兰来到美国。《牛津词典》

2·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》

3·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。《柯林斯英汉双解大词典》

4·My ancestors were from Spain.

我的祖先是西班牙人。

5·They are the ancestors of today's Inuit people.

他们是当今因纽特人的祖先。

6·It contains no ancestors of modern animal groups.

它不包含现代动物群体的祖先。

7·Our ancestors merely made use of their hands to change nature.

我们的祖先只凭双手改造自然。《新英汉大辞典》

8·Our palaeolithic ancestors consumed around 100g of fibre per day.

我们旧石器时代的祖先每天消耗约100克纤维。

9·For most of our evolutionary history, our ancestors lived in tribes.

在人类进化史的绝大多数时间里，我们的祖先都生活在部落里。

10·Later ancestors still evolved back into the water and became sea turtles.

后来的祖先仍然进化回水中，变成了海龟。

祖先

1·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。《柯林斯英汉双解大词典》

2·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》

3·They are the ancestors of today's Inuit people.

他们是当今因纽特人的祖先。

4·It contains no ancestors of modern animal groups.

它不包含现代动物群体的祖先。

5·Our ancestors merely made use of their hands to change nature.

我们的祖先只凭双手改造自然。《新英汉大辞典》

先祖

1·Our ancestors seem to have had a regular system of 26 symbols, which may have been the origins of written language.

我们的先祖似乎已经有了具有26个符号的有规则体系，它们可能就是我们现在书面语言的来源。

2·Massive galaxies that existed during the first billion or so years of cosmic history are believed to be the early ancestors of these ellipticals.

人们相信，宇宙最初的十亿年间已经存在的大星系是这些椭圆星系的先祖。

3·It made us as much a part of nature as hummingbirds and bumblebees (or humble-bees, as Darwin called them); we, too, acquired a family tree with a host of remarkable and distinguished ancestors.

它也使人类同蜂鸟和黄蜂(或者如达尔文所称的蜜蜂)一样成为大自然的一部分。我们人类也一样，获得了自己的家族系谱，并且有着杰出不凡的先祖。

4·Afro-Cuban emigre Philbert Armenteros, founder of the Miami band Los Herederos (The Inheritors), says his music can channel important messages from the gods of his African ancestors.

非洲裔古巴人流亡者、迈阿密乐队 Los Herederos（The Inferitors）的创始人 Philbert Armenteros 说他的音乐能够传达来自他的非洲先祖之神的重要信息。

5·His ancestors and he were the exclusive inhabitants on the mountain for several centuries.

他的先祖是这里唯一的原住民，他们在这里已经有几个世纪了。

先辈

1·Like toppling dominoes, the next generation of programs follows the trend of its ancestors.

就像推度多米诺骨牌一样，下一代的程序跟随着它的先辈的足迹。

2·To this day, countless ancestors paid blood and lives, and it was also a myriad of blood and life for our today's peace and a better life.

为了这一天，无数先辈付出了鲜血和生命，也正是无数的鲜血和生命换来了我们今天的和平与美好生活。

3·Historically, Emerson marks one of the largest against the Calvinism of his ancestors.

在历史上，爱默生是他的先辈敬奉的加尔文主义最大的反对者之一。

4·Men and women who want nothing more than the chance to earn their way into the American story, just like so many of our ancestors did.

男男女女们和我们的先辈一样仅仅希望获得进入美国的机会。

5·I stand here today humbled by the task before us, grateful for the trust you have bestowed, mindful of the sacrifices borne by our ancestors.

今天，我站在这里，在重任面前，我感到卑微，各位的信赖令我感激，先辈的牺牲我铭记于心。

祖辈

1·The ancestors good at catching lobster fishermen, the best-selling products at home and abroad, very well-known.

这里的渔民祖辈善于捕捉龙虾，产品畅销海内外，十分驰名。

2·Years ago, he moved to Fujian, China, Southeast Asia by the ancestors, have accumulated substantial assets and reputation.

早年，他祖辈由中国福建迁居南洋，积累下丰厚的财产跟声望。

3·If you look deeply into the palm of your hand, you will see your parents and all generations of your ancestors.

若细细地观察自己手掌，从中你会看到父母和祖辈们的身影。

4·And there claim the fathers of ancestors Traitor, the soul deceived. Honour belied.

那是祖辈的祖辈们叛逆的宣言，灵魂伪欺，荣誉虚恶。

5·My ancestors were all farmers.

我的祖辈们都是农夫。

上代

1·Since it is the genetic potential of ancestors that determines breeding success, any cat you are thinking of breeding should possess outstanding qualities worthy of being passed on to offspring.

因为上代的遗传潜力决定了后代的质量，你想要繁育的猫应该拥有值得遗传给后代的杰出的品性。

(1)ancestor worship祖先崇拜；祭祖；敬奉祖先