Psychologists have spent years analysing human interactions to try to work out what it is that makes someone nod.The results have been poor.

心理学家们多年来一直在分析人类的互动行为，试图发现使一个人点头的工作机理，然而所得甚少。

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Psychologists have spent years analysing human interactions to try to work out what it is that makes someone nod. The results have been poor.

心理学家已花费数年时间来分析人类的交流过程以找出触发人类“点头”的机制，而结果并不理想。

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These interactions are being explored because XML Schema often has poor semantics and requires more human interactions to deduce similar facts.

这些相互关系需要进行挖掘，因为XML模式的语义通常很差，并且需要更多的人类参与才能推断出类似的事实。

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Zakiyah Ansari, the advocacy director for the Alliance for Quality Education and a mother of eight, said she believed the poor economy was partially to blame for the declining number of parent meetings and interactions.

WSJ: Parents Seen Less Involved in Schools