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。
She found similar interference when participants watched 15-second clips of pairs of people and judged whether they were strangers, friends, or dating partners.
她发现当参与者观看 15秒的两人片段并判断他们是否是陌生人、朋友或恋爱伴侣时，出现了类似的干扰。
But when Swetnam enrolled in graduate school at the University of Arizona's Laboratory of Tree-Ring Research, he was surprised to find a record of repeated blazes dating back hundreds of years before European colonists arrived on the continent.
但当斯威特纳姆进入亚利桑那大学的树木年轮研究实验室读研究生时，他惊讶地发现，早在欧洲殖民者到达大陆数百年之前，就有重复的火灾记录。
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。