她拍照时，脸上是非常夸张的悲伤表情。
Ms Mobin also took photos with an exaggerated sad expression on her face while she travelled.
研究人员随后对每一种表情的全部干扰图像进行了分类，揭示出传递欢乐与悲伤表情的面部特征的细微区别。
The researchers then averaged all of the noisy images in each category of emotion, revealing the subtleties in the facial features needed to spell out happiness or sadness.
两天之内，婴儿就能模仿悲伤和快乐的表情。
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