Living in an urban area with green spaces has a long-lasting positive impact on people's mental well-being, a study has suggested.

一项研究表明，生活在有绿色空间的城市地区对人们的心理健康有长期的积极影响。

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An urban area is the region surrounding and including a city.

市区是指城市周围并包括城市在内的区域。

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They offer those condemned to spend five days a week in an urban environment an unrivalled area of freedom to unwind and take part in a range of leisure activities, such as hunting, riding and hiking.

它们为那些每周有五天都得待在城市里的人提供了一个无与伦比的自由空间，让他们放松身心，参加各种休闲活动，比如打猎、骑马和远足。

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Experts say terrorist groups are seeking materials for a crude nuclear device - a so-called "dirty bomb" - that would have limited blast potential but could spread radiation in a major urban area.

VOA: standard.2010.04.11

When we think of cybersecurity threats, most often we imagine a smelly and unshaven super-genius, holed up in a ramshackle studio apartment in a dodgy urban area, working through a high-speed Internet connection to penetrate the defenses of surrounding servers.

FORBES: Magazine Article

Some assume a walk in a crowded urban area will be slower than in a park, while others ignore stops at traffic lights.

WSJ: Timing an Urban Stroll Isn't a Walk in the Park

But in my mind, you can have a small town, a niche community within a large urban area, too.

FORBES: How to Radically Revitalize America: a Micropolitan Manifesto