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There are numerous high buildings, heavy traffic, and dense population in modern cities.

现代都市到处高楼耸立，交通拥挤，人口稠密。

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The young inventor envisages PaveGen systems being used to power off-grid appliances such as public lighting, illuminated street maps and advertising, and to be installed in areas of dense human traffic such as city centers, underground stations and school corridors.

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To address the crush, carriers are offloading data traffic from dense urban areas onto Wi-Fi networks, while also seeking out more spectrum.

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The popularity of the City's scheme suggests that the advantages of traffic restriction in dense urban areas may have been underestimated in the past.

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