Put focal point on coal seam roof and floor engineering geological characters.
重点阐述了煤层顶底板工程地质特性；
Built to strict hurricane codes, the booth features a copper standing-seam roof, gutters, and downspouts.
建筑严格遵守预防飓风守则，展台设计了铜制直立屋顶，水槽和水落管。
The stability of seam roof is one of the most important case that influences the safety of coal extraction.
煤层顶板的稳定性是影响煤层回采工作安全最重要因素之一。
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