提供一篇英文文章并要求将其翻译成中文。


“A new study shows that spending just 20 minutes in nature can reduce stress hormones. Researchers at the University of Michigan found that participants who spent 20 minutes in a park or nature reserve had lower levels of cortisol, a hormone commonly used to measure stress, compared to those who spent 20 minutes in a city environment. The study suggests that even a short nature break can have a positive impact on our health and well-being.”
一项新的研究显示，只要在大自然中呆上20分钟就可以降低压力激素。密歇根大学的研究人员发现，在公园或自然保护区呆上20分钟的参与者的皮质醇水平（一种用于测量压力的激素）要低于那些呆在城市环境中20分钟的人。该研究表明，即使是短时间的自然休息也可以对我们的健康和福祉产生积极影响。