观察每张脸2000毫秒或39毫秒后，参与者要根据自己的看法，为每个人的攻击性程度进行一至七级的等级评定。
The participants then rated how aggressive they thought each person was on a scale of one to seven, after viewing each face for either 2000 milliseconds or 39 milliseconds.
如果用一至七级来衡量，卫生和教育水平为二级。
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