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。
Spontaneous smiles were relatively easy to capture by the 1890s, so we must look elsewhere for an explanation of why Victorians still hesitated to smile.
到了1890年代，捕捉自发的笑容已经相对容易，因此我们必须从其他方面寻找解释，说明维多利亚时代的人为何仍然犹豫于露出笑容。
A toothy grin (especially when there were gaps or blackened gnashers) lacked class: drunks, tramps, and music hall performers might gurn and grin with a smile as wide as Lewis Carroll's gum-exposing Cheshire Cat, but it was not a becoming look for properly bred persons.
露出牙齿的笑容（尤其是当有牙缝或发黑的牙齿时）显得缺乏教养：醉汉、流浪汉和音乐厅的表演者可能会像刘易斯·卡罗尔笔下露出牙龈的柴郡猫一样咧嘴大笑，但对真正有教养的人来说，这种笑容并不合适。
Even Mark Twain, a man who enjoyed a hearty laugh, said that when it came to photographic portraits there could be "nothing more damning than a silly, foolish smile fixed forever".
即使是喜欢开怀大笑的马克·吐温，也说过在拍摄肖像照时，"没有什么比永恒定格的傻笑和愚蠢笑容更令人不齿的了。"
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。