A risk assessment matrix is built up through grading the hazards of regional debris flow and the social economic vulnerability.

通过将泥石流灾害的危险性和区域社会经济易损性进行分级，建立了风险评价矩阵。

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Through the analysis on the social background, cultural background and media background of sport media grading, the article points out the problems and challenges sport media grading is facing.

通过对体育媒介分层社会背景、文化背景、媒介背景的分析，指出了体育媒介分层所面临的问题和挑战。

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