Today, because of shrewd advertising and public health campaigns, many Americans habitually give their pearly whites a cavity-preventing scrub twice a day, often with Colgate, Crest or one of the other brands.
如今，由于精明的广告和公共卫生运动，许多美国人习惯于每天两次用牙膏（如佳洁士、高露洁或其他品牌）清洁牙齿，以预防龋齿。
A flashing set of healthy and clean, regular 'pearly whites' was a rare sight in Victorian society, the preserve of the super-rich (and even then, dental hygiene was not guaranteed).
在维多利亚时代社会中，一口洁白、干净、整齐的牙齿是罕见的景象，只有超级富有的人（即使如此，口腔卫生也并不一定有保障）才拥有。
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。