不依附于任何机构：Work indipendently of any institution
结构提示：that some diseases 是前面 the idea 的同位语从句，not previously thought to have a bacterial cause做后置定语修饰前面的diseases,主干是some diseases were actually infections.
帮助普及该观点：Help popularize the idea
Even he, however,might tremble at the thought of what he is about to do.
以前被认为是不相关的have previously been thought unrelated
引起了很大的争议：Arouse much controversy
一想到……就害怕的身体颤抖：Tremble at the thought of
They also suffer more often than most people from a number of nasty genetic diseases, such as breast cancer. These facts , however, social effects, such as a strong tradition of valuing education. The latterwas seen as a consequence of genetic isolation .Dr.Cochran suggests that the inteligence and diseases are intimately linked. His argument is that the unusual history of these people has subjected them to unique evolutionary pressures that have reasulted in this paradoxical state of affairs.
高度重视教育的传统a strong tradition of valuing education
Dr.Cochran suggests that the intelligence and diseases are intimately linked.
The idea that some groups of people may be more intelligent than others is one of those hypotheses that dare not speak its name. But Gregory Cochran is prepared to say it anyway. He is that rare bird, a secientist who works independently of any institution. He helped popularize tha idea that some diseases not previously thought to have a bacterail cause were actually infections ,which aroused much controversy when it was first suggested.
被看做基因隔离的结果 be seen as a consequence of genetic isolation
不敢公开：Dare not speak its name
密切相关 be intimately linked
矛盾的状态 paradoxical state of affairs
使他们承受独特的进化力量have subjected them to unique evolutionary pressures
归因于社会影响 have been put down to social effects
优盈娱乐注册， He helped popularize the idea that some diseases not previously thought to have a bacterial cause were actually infections , which aroused much controversy when it was first suggested.
由细菌引起的：Have a bacterial cause