公园里成片成片的绿化地区能保护自然生态，供给洁净的空气和水源，对人和动物都有利。 。
Thee interconnected system of green spaces in the parks can conserve natural ecosystem values and functions, sustain clear air and water, and provide a wide array of benefits to people and wildlife.
来自英国埃克塞特大学的合著者马修·怀特解释说，这项研究表明，生活在绿化较好的城市地区的人们表现出的抑郁或焦虑症状较少。
Co-author Mathew White, from the University of Exeter, UK, explained that the study showed people living in greener urban areas were displaying fewer signs of depression or anxiety.
怀特说，他的团队想知道生活在绿化较好的城市地区是否会对人们的幸福感产生持久的积极影响，还是说这种影响会在一段时间后就消失。
White said his team wanted to see whether living in greener urban areas had a lasting positive effect on people's sense of well-being or whether the effect also disappeared after a period of time.
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