With the rapid expansion of city scale and the excessive concentration of population, the sound urban disaster prevention system has become a necessary arduous task.
随着城市规模的急速扩大和人口的过度集中，健全城市防灾系统已成为一项不容忽视的艰巨任务。
In recent years, the economy amount, population of Beijing increase rapidly, the city scale enlarged suddenly, and thus brings large press to the urban traffic.
近年来，北京市的经济总量迅猛增长，城市人口不断膨胀，城市规模急剧扩大，由此也给城市交通造成巨大的压力。
The scale of urban population has become one of the most important research fields in urban science because of its mutability and the importance of determining it.
城市人口规模的易变性及界定的重要性使其成为城市科学中重要的研究领域。
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