But because hard laughter is difficult to 4 , a good laugh is unlikely to have 5 benefits the way, say, walking or jogging does.
但因为剧烈大笑难以4，一次良好的大笑不太可能像散步或慢跑那样带来5益处。
Studies dating back to the 1930s indicate that laughter 8 muscles, decreasing muscle tone for up to 45 minutes after the laugh dies down.
20 世纪 30 年代的研究表明，笑能放松 8 块肌肉，使肌肉张力在笑停止后降低长达 45 分钟。
People have been surprised to see evidence that Victorians had fun and could, and did, laugh.
人们看到维多利亚时代的人们也有乐趣，并且能够、也确实会笑，感到很惊讶。
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。