... 低级瓦斯矿：slightly gassy mine 低层平硐：deep adit 低槽：conditioner ...
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The paper reviews the design and construction of the long inclined shafts, the deep vertical shaft, the parallel adit and the access adit for the tunnel.
文章介绍了越岭隧道的长斜井、深竖井、平导、横洞的设计和施工情况。
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