Psychologist Nina Strohminger at the University of Pennsylvania, who was not involved in the study, says she wants the effect to be real but cannot rule out some unknown confounding variable.
没有参与这项研究的宾夕法尼亚大学心理学家尼娜·施特罗明格指出，她希望这种影响是真实的，但不能排除一些未知的混杂变量。
As far as skulls are concerned, there is one confounding variable: climate.
至于说到头骨，这里有个容易混淆的变化因素：气候。
As far as skulls are concerned, there is one confounding variable: climate.
至于说到头骨，这里有个容易混淆的变化因素：气候。
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