translation.en: In studies conducted in Papua New Guinea, Paul Ekman, the world's most renowned researcher on facial expressions, found that even members of the Fore tribe, who were completely disconnected from Western culture, and also known for their unusual cannibalism rituals,  attributed smiles to descriptions of situations the same way you and I would.
translation.zh: 在巴布亚新几内亚进行的一些研究中 保罗. 艾克曼 世界上最知名的面部表情研究者 发现原始部落Fore的成员 虽然与西方文化相隔绝 并以其食人肉的宗教习性著称 但他们也像我们一样 在不同场合下会露出微笑