Terms for subject Technology containing bottom- drift method

English	Chinese
bottom-drift and ring-cut method	下导坑核心支承开挖法
bottom-drift excavation method	下导坑先墙后拱法
bottom-drift excavation method	下导坑漏斗棚架法
bottom-drift excavation method	漏斗棚架式隧道开挖法
bottom-drift method	下导洞推进法
bottom-drift method	下导坑超前先拱后强法