They are employed by roofing and general contractors, or they may be self-employed.
他们受雇于屋面和总承包商，或者有可能成为自雇人士。
This unit group includes roofing, masonry, painting and other construction trade contractors, not elsewhere classified, who own and operate their own business.
本单元组包括拥有并经营自己的业务的屋顶，砖石，绘画和其他建筑行业承包商及其他未分类的。
This park had once been an enormous, polluted excavation pit from which Parisian contractors mined clay to manufacture the city's famous red roofing tiles-or tiles.
这个公园曾经是一个被污染的大坑，黎承包商从这里挖粘土烧制巴黎著名的房顶红瓦——这个词的法语语音为杜伊·勒里。
This park had once been an enormous, polluted excavation pit from which Parisian contractors mined clay to manufacture the city's famous red roofing tiles-or tiles.
这个公园曾经是一个被污染的大坑，黎承包商从这里挖粘土烧制巴黎著名的房顶红瓦——这个词的法语语音为杜伊·勒里。
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