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.

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所以，科恩博士计划重复试验，以确认发音和肢体语言的意义。

So, Dr King plans to repeat the experiment, controlling for the meaning of both utterances and gestures.

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