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潜孔钻机 qiánkǒng zuànjī
eng.geol.	downhole drill; downhole drilling machine; submersible boring rig
hydroel.st.	down-the-hole drill
railw.	diving drill
tech.	downhole driller; downhole drilling machine; in hole perforator; in-the-hole drill
潜孔钻机以冲击器潜人孔内直接冲击钻头破岩的钻孔机械。它的特点是钻杆传递冲击能的过程没有能量损失,钻孔深度对钻速的影响小，工作噪声低 qiánkǒng zuànjī
expl.	down-the-hole drill; down-the-hole hammer

潜孔钻机: 13 phrases in 2 subjects

Engineering geology	3
Technology	10