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。
The premise was that the common law of contract lacked sufficient safeguards for workers against arbitrary conduct by management.
其前提是，合同的普通法缺乏足够的保障措施，以防止管理层的任意行为对工人造成损害。
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。