发现与人口普查区重叠的邮政编码区域，并发现这些区域中最小边界矩形(MBR)内的所有街道。

Find all zip code areas that overlap with any of the census blocks, and find all streets that lie within the minimum bounding rectangle (MBR) of any of those zip code areas.

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据华盛顿大学公共健康营养中心的一项调查显示，只有15%的人口在他们自己的普查区范围内购买食品。

Research by the Centre for Public Health Nutrition at the University of Washington found that only 15% of people shopped for food within their own census area.

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这是因为在美国，任何普查区中，只要其20%以下的居民低于贫困线，33%的居民于距离超市一英里之外居住，那么该地区即被定义为食品沙漠。

This is because in America, the definition of a food desert is any census area where at least 20% of inhabitants are below the poverty line and 33% live more than a mile from a supermarket.

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