科恩博士说：“NHANES III是一项观察上的研究而不是一次临床试验，所以，关于因果没有一个确定的结论是可能的。”
Since NHANES III was an observational study and not a clinical trial, no definite conclusions about cause and effect were possible, says Dr. Cohen.
相反罗伯·科恩1993年关于武打明星李小龙的传记片却是个巨大的失败虽然同样票房成绩还勉强不错。
By contrast, Rob Cohen's 1993 biopic of the legendary martial artist Bruce Lee was a fair critical hit, also performing reasonably at the box office.
设想一下，比如说，印第安纳大学的唐纳·埃德尔和珍妮特·林恩。恩科在早期关于中学流言的研究中的流言记录。
Consider, for instance, the cascade of insults recorded in the earlier study of middle-school gossip by Donna Eder and Janet Lynne Enke of Indiana University.
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