[] the place deep inside a mine where the coal is cut out of the rock（煤矿井里的）采煤工作面，采掘面●at the ˈcoalface () where the real work is done, not just where people talk about it在工作第一线；在工作现场◆Some managers would benefit from spending a few weeks at the coalface.有些经理因到了工作现场数周而获益。