【英语时差8,16】为什么禁止近亲结婚？

It’s a distressing¹ fact that human activities are causing the wide-scale extinction² of other species on earth. Something you may not know, however, is that the fewer animals there are in a given species, the more at risk that species is — and not just because it’s easier for a small group to disappear than a large group. Another danger is inbreeding. Inbreeding is the term used when animals mate with their relatives. All animals, including humans, inherit half their genes³ from their mothers and half from their fathers. Within certain limits, it’s good for offspring to have a father whose genetic⁴ makeup⁵ is significantly different from its mother’s. It’s kind of like poker⁶. Reshuffling the deck makes it more likely you’ll draw a good hand by chance. If the deck were only sixteen cards, each of which appeared twice, the chances of getting a good hand would be much lower.

 

1 distressing   

a.使人痛苦的

参考例句：

• All who saw the distressing scene revolted against it. 所有看到这种悲惨景象的人都对此感到难过。
• It is distressing to see food being wasted like this. 这样浪费粮食令人痛心。

2 extinction   

n.熄灭，消亡，消灭，灭绝，绝种

参考例句：

• The plant is now in danger of extinction.这种植物现在有绝种的危险。
• The island's way of life is doomed to extinction.这个岛上的生活方式注定要消失。

3 genes   

n.基因( gene的名词复数 )

参考例句：

• You have good genes from your parents, so you should live a long time. 你从父母那儿获得优良的基因，所以能够活得很长。 来自《简明英汉词典》
• Differences will help to reveal the functions of the genes. 它们间的差异将会帮助我们揭开基因多种功能。 来自英汉非文学 - 生命科学 - 生物技术的世纪

4 genetic   

adj.遗传的，遗传学的

参考例句：

• It's very difficult to treat genetic diseases.遗传性疾病治疗起来很困难。
• Each daughter cell can receive a full complement of the genetic information.每个子细胞可以收到遗传信息的一个完全补偿物。

5 makeup   

n.组织；性格；化装品

参考例句：

• Those who failed the exam take a makeup exam.这次考试不及格的人必须参加补考。
• Do you think her beauty could makeup for her stupidity?你认为她的美丽能弥补她的愚蠢吗？

6 poker   

n.扑克；vt.烙制

参考例句：

• He was cleared out in the poker game.他打扑克牌，把钱都输光了。
• I'm old enough to play poker and do something with it.我打扑克是老手了，可以玩些花样。