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sinking shaft
meaning in English
直下沉井法
Examples
A rock - boring tool used in mining for
sinking shafts
钻井机一种在采矿中用来挖掘矿井时在石头上打孔的工具
The methods for treating the sand drifting in the construction of the
sunken shaft
关于沉井施工中流沙的处理方法
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