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。
In the economic transitional period, there is a big uncertainty to predict the urban land scale by predicting the population scale, which now can not meet the requirements of the urban administration.
在我国经济转型阶段，通过预测人口规模来确定用地规模的方法存在着较大的不确定性，不能完全适应现在的城市管理需要。
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。
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