dirt n. 1.污物;烂泥;油垢;灰尘。 2.泥土;土地;【矿物】含金土。 3.毫无价值的东西。 4.肮脏,下贱,卑鄙。 5.骂人话,恶言。 6.下流话,下流作品。 7.〔美俚〕闲谈,聊天;钱;糖;秘密情报;〔美乐俚〕 = blues. treat a person like dirt 视某人如草芥。 common as dirt 草芥一样到处皆是的,平凡的。 yellow dirt 〔蔑称〕黄金。 (as) cheap as dirt 极其便宜的。 cut dirt 〔美俚〕逃走。 do sb. dirt 〔美国〕用卑鄙手段[恶言恶语]陷害某人。 eat dirt 忍辱。 fling [throw] dirt at 臭骂。 hit the dirt 落在地上。 talk dirt 说下流话[猥亵话]。
Sub - level caving mining with seam of thickness dirt band 含厚夹矸煤层的综放开采
It was found that comparing with the case without dirt band the periodic weighting distance , median roof moving coefficient and support resistance all increased to different extent because of the influence of dirt band 发现由于夹矸的影响,与不含夹矸层工作面相比,其周期来压步距、平均动压系数和支护阻力都有不同程度的增大。
The in - situ measurement and analysis of support resistance and top - coal movement in fully - mechanized top - coal caving face of a thick coal seam with dirt band had been carried out in some coal mine , the strata behavior and movement law of top - coal were revealed 摘要对某煤矿含夹矸煤层综放面的支架工作阻力和顶煤移动进行了现场观测和分析,揭示了其矿压显现和顶煤运移的规律。