同根派生 英汉例句The mine streched three miles into an ore bed.矿山绵延三英里进入矿层。Yamansu Formation of the Lower Carboniferous comprises the main ore-bearing formation in the Xiaoshitouquan ore district.摘要小石头泉矿区主含矿层为下石炭统雅满苏组第二亚组，火山穹隆及伴生断裂为主要的控矿构造。