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They looked into the cameras with a neutral facial expression.
VOA: special.2009.11.24
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It is a basic emotion with a characteristic facial expression.
这是很基本的一种情绪,还伴有特定的面部表情。
耶鲁公开课 - 心理学导论课程节选
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It has a distinctive facial expression again.
又一次有了与众不同的面部表情。
耶鲁公开课 - 心理学导论课程节选