整个流域的人口分布沿黄河河道由下游往上，人口密集程度呈梯度递减的特征。
There were grades in the population intension level from the lower reaches of the river to the upper river.
这里的复杂程度指的是把人们组织成大型的、多样化的群体和人口密集的社区。
The level of complexity here refers to the organization of people into large, diverse groups, and densely populated communities.
尤其是城市化进程的加快，使人口和经济高度密集，各种突发事件的危害程度也明显增大。
Especially the expediting urbanization causes population and economics centralized highly. The damage of all kinds of emergency become seriously.
尤其是城市化进程的加快，使人口和经济高度密集，各种突发事件的危害程度也明显增大。
Especially the expediting urbanization causes population and economics centralized highly. The damage of all kinds of emergency become seriously.
应用推荐