煤矿开拓掘进
Coal mine development and tunneling
以上为机器翻译结果，长、整句建议使用 人工翻译 。
目前煤矿岩巷开拓任务重，岩巷机械化掘进成为各矿普遍存在的技术难题。
Developing rock roadway of coal mine is a hard task at present. Mechanized drivage of rock roadway has become a common technical problem of every coal mine.
youdao
应用推荐
模块上移
模块下移
不移动