coal roadway excavation

• 煤巷掘进

coal roadway excavation的用法和样例：

例句

1. Outburst prevention technique of excavating in coal seam will be directly concerned colliery safety production and excavates taking over.
   摘要突出煤层煤巷掘进防突直接关系到煤矿的安全生产和采掘接替。