With the accelerating process of urbanization, the community is becoming the main area where young people flow to.
当前，随着城市化进程的不断加快，社区正成为广大青少年集中流向的主要区域。
Main factors effecting on flow rate in braided river is gradient of anabranch, area of water, roughness and velocity.
影响汊道分流比的主要因素有：两汊的比降、过水断面积、糙率、流速等。
The third part is principal character of debris flow in the research area, involving its survey, law of distribution, main types, activity characters and development trend.
第三部分为研究区泥石流的主要特征，包括泥石流灾害概况、分布规律、主要类型、活动特点以及泥石流的发展趋势。
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