机组人员向乘客演示了遇到紧急状况时该怎么做。
The crew demonstrated to passengers what to do in an emergency.
研究人员通过实验发现，学生可以习得更积极的压力应对方式。
Researchers found through experiments that students could be taught to respond to stress in a more positive way.
研究人员推测，手艺活动促进了大脑神经通路的发展，有助于保持认知健康。
The researchers speculate that craft activities promote the development of nerve pathways in the brain that help to maintain cognitive health.
六个月后，研究人员发现高蛋白组的肌肉功能明显改善——几乎是对照组的两倍。
After six months, researchers found the high protein group had significantly improved their muscle function—almost twice as much as the control group.
研究人员蒂莫西·索尔特豪斯称，大多数人即使到了晚年，思维能力仍处于较高水平。
Most people's minds function at a high level even in their later years, according to researcher Timothy Salthouse.
我们友好、努力的工作人员帮助了许多来自世界各地的学生实现了在生活中使用英语的梦想。
Our friendly hard-working staff have helped many students from all over the world achieve their dream of using English in their lives.
许多医生和研究人员认为，孤独会损害免疫系统，使我们更容易患上一系列轻微和重大疾病。
Many doctors and researchers believe that loneliness harms the immune system, making us more vulnerable to a range of minor and major illnesses.
当医学研究人员了解了如何预防疾病并阻止其传播时，全世界许多人的生活质量得到了改善。
When medical researchers learned how to prevent diseases and stop them from spreading, the quality of life for many people around the world improved.
如今，随着经济的发展和生活水平的提高，越来越多的中国人包括许多农民和外出务工人员都能乘飞机出行。
Nowadays, with the development of China's economy and the improvement of people's living standards, more and more Chinese people, including many farmers and migrant workers, can travel by air.
研究人员已经证实，当人们动脑筋时，大脑中会发生生化变化，使其在注意力和记忆等认知区域更有效地发挥作用。
Researchers have established that when people are mentally engaged, biochemical changes occur in the brain that allow it to act more effectively in cognitive areas such as attention and memory.
正如研究人员之一罗伊·鲍迈斯特告诉我的那样：“我们作为人类的其中一部分职责是照顾他人，为他人做出贡献。”
As Roy Baumeister, one of the researchers, told me, "Partly what we do as human beings is to take care of others and contribute to others."
对世界各地的生物医学研究人员来说，双胞胎提供了一个宝贵的机会，来解开基因和环境——也就是先天和后天的影响之谜。
To biomedical researchers all over the world, twins offer a precious opportunity to untangle the influence of genes and the environment—of nature and nurture.
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