The problem is greater in summertime, particularly in the world′s major cities.

在夏季问题更严重，特别是在世界各地的主要城市中。

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It is one of the Europe "s major cities with a population exceeding 1."6 million and constitutes a melting pot of citizens from all over Central and Eastern Europe.

它是欧洲主要城市之一，其人口数超过160万，由来自中欧和东欧的公民混杂组合而成。

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Today, the research on fringe area of big cities' which began in early 1970's have become one of major subjects in the urban science.

有关大城市边缘区的研究，在国外开始于70年代早期，目前已成为国外城市学界研究的主要课题之一。

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The commission held public hearings in Sierra Leone's major cities and regional towns, but did not reach remote villages like Dugba-yeima.

VOA: standard.2010.06.07

Al-Iryani says the warnings are harming his country, and that Yemen's major cities and almost all its roads are safely controlled by the central government.

VOA: standard.2010.04.20

In addition to the two governor's races, there will be special elections for U.S.House seats in New York and California, and mayoral elections in several major U.S.cities including New York,Boston, Houston,Detroit,Pittsburgh, Seattle and Minneapolis.

VOA: standard.2009.10.23

Now several have been established, with a presence in most of the country's major cities.

BBC: The angels helping Indian start-ups spread their wings

The military operation in Mali scored quick successes, forcing the jihadists out of northern Mali's major cities.

NPR: Chad's Leader: Troops To Leave Mali Guerrilla War

Much of Khan's support has come from young, middle-class Pakistanis in the country's major cities, a potentially influential group.

NPR: Pakistan's Imran Khan Has 3 Fractured Vertebrae