Those forced to exercise their smiling muscles 18 more enthusiastically to funny cartoons than did those whose mouths were contracted in a frown, 19 that expressions may influence emotions rather than just the other way around.
被迫更积极地使用微笑肌肉观看搞笑卡通的第 18 组比嘴巴皱成皱眉的第 19 组更热情，这表明表情可能影响情绪而非仅仅是情绪影响表情。
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。