The deformation characters of the broken rocks are the important factors that affect the roof caving and surface subsidence above goaf in coal mining.

破碎岩石的变形性质是影响采空区覆岩垮落与地表沉陷的重要因素。

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They built thousands of circular stone windbreaks and gardened inside them, and used broken volcanic rocks to keep the soil moist.

他们建造了成千上万的圆形石质防风林并在其中种植花草，还用破碎的火山岩来保持土壤湿润。

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The rocks get broken down into smaller and smaller particles as they are weathered.

岩石在风化过程中被分解成越来越小的颗粒。

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Mr. Jesalva, 21 years old, who sustained a broken shoulder due to falling rocks, also recalled a loud explosion.

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