短語詞組短語drifting g method 掘進(jìn)法drifting by special method 平巷特殊法掘進(jìn)raise -boring machine pilot drifting method 反井鉆機(jī)導(dǎo)硐施工法drifting by new Austrian method 新奧法掘進(jìn) 返回 drifting method