6 instead of straining muscles to build them, as exercise does, laughter apparently accomplishes the 7 .
6 与锻炼通过拉伸肌肉来增强肌肉不同，笑声显然达到了 7 的效果。
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。
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。
It 6 out that the brain needs exercise in much the same way our muscles do, and the right mental 7 can significantly improve our basic cognitive 8 .
结果表明大脑需要像肌肉一样进行锻炼，而适当的脑力锻炼可以显著提升我们的基本认知功能。
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。