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。
Along with the swift development of Chinese economy, Chinese city scale is extended rapidly, city population increases fast.
随着中国经济的迅猛发展，中国的城市规模急剧扩张，城市人口飞速增长。
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。
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