The US scientists led by Dr Herman Pontzer at the University of Washington, St Louis, based their findings on the estimated amount of energy dinosaurs must have expended moving about.

该研究是由美国华盛顿大学圣路易分校的Herman Pontzer 博士及其同事共同完成的。 他们通过估算恐龙在活动时所消耗的能量，得出了该结论。

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We swing our arms simply because it would take extra mental and physical effort to keep them still, says Herman Pontzer, a biomechanics researcher at Washington University in st Louis.

根据圣路易斯华盛顿大学生物力学专家Herman Pontzer的说法，我们之所以要摆臂，是因为不这样的话就需要在意识上以及生理上额外花些气力才能使得手臂保持静止。

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