Despite the difficulty in deciding on the optimum city population size, such studies will go on endlessly.

尽管确定城市最优人口规模非常困难，但对其研究不会终止。

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The city population size does not have much relationship with per capita GDP, even has a negative impact on the group of large cities.

人口规模与城市人均gdp之间关系不大，在大城市组甚至呈负相关。

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If you are referring to population size, however, that is the size of a small city.

以人口数量角度来说，它只相当于一座小城市的人口数量。

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In a city with a population two thirds the size of Belfast, they are achieving enormous success and they have been at it for more than 20 years.

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In comparison with cities of a similar size in population, drivers in the city of San Jose waste a cumulative of 10 million more annual hours sitting in traffic jams and suffer a 15% higher commute delay per peak-time traveler.

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Brigadier Michael Ondoga, of AMISOM, told CNN recently that although Al-Shabaab was "largely defeated" in Mogadishu, there were still issues with its members "melting into the population" and taking advantage of the city's large size to hide.

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