In an experiment published in 1988, social psychologist Fritz Strack of the University of Würzburg in Germany asked volunteers to 16 a pen either with their teeth - thereby creating an artificial smile - or with their lips, which would produce a(n) 17 expression.
1988年发表的一项实验中，德国维尔茨堡大学社会心理学家弗里茨·斯特拉克让志愿者用牙齿16一支笔——从而形成人工微笑——或用嘴唇17一支笔，这会产生一种17的表情。
Nature gave us lips to conceal our teeth," ran one popular Victorian maxim, alluding to the fact that before the birth of proper dentistry, mouths were often in a shocking state of hygiene.
有一句流行的维多利亚时代的格言说："大自然赋予我们嘴唇，是为了遮掩牙齿，" 这句话暗示了在正规牙科诞生之前，人们的口腔卫生状况常常令人震惊。
例句取自历年考研英语真题，翻译为机器生成，仅供学习参考。