The use of sequential reaming head for raising is a new technology, which can make a small-sized drill to be used for boring a large-sized raise.
用迈步式扩孔刀头钻凿天井是一项新技术，该技术能够用小钻机钻凿大天井。
The use of sequential reaming head for raising is a new technology, which can make a small-sized drill to be used for boring a large-sized raise.
用迈步式扩孔刀头钻凿天井是一项新技术，该技术能够用小钻机钻凿大天井。
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