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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For some courses, papers or projects are assessed through a peer grading system.

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Ofqual acknowledged grade boundaries had changed part way through the year, but stood by a new June grading system in a row over results.

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The trouble, say critics, is the combination of strict grading with an overloaded timetable and a focus on learning through failure.

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