研究生科技英语阅读课文翻译对照(13)

Many of these microorganisms evolved symbiotically with humans over millions of years -- the so-called "old friends" theory. But where they"ve been eradicated, a key part of human development has been thrown off. 数百万年以来，许多微生物与人类形成一种共生共栖的关系，就像我们的“老朋友”一样；如果我们将某种微生物连根拔除，就等于错过了人体进化历程中的一个关键环节。
"The vast majority of microbes are harmless. There are only a few dozen that can cause lethal infections," says Thomas McDade, director of the Laboratory for Human Biology Research at Northwestern University.
“绝大多数微生物都是无害的，只有几十种微生物会引发致命感染。”美国西北大学(Northwestern University)人体生物研究实验室(Laboratory for Human Biology Research)主任麦克戴德(Thomas McDade)说道。
In 1998, about 1 in 5 children in industrialized countries suffered from allergic diseases such as asthma, allergies and rashes, according to the International Study of Asthma and Allergies in Childhood, a global research initiative. The incidence of peanut allergy in the U.S. tripled between 1997 and 2008, according to a report from Mount Sinai School of Medicine in New York.