- cover hole
- 超前: speed-up; outstrip; lead; le ...
- 孔: hole; opening; aperture
- 探水钻: water exploring drill; waterpro ecting drill; waterprospecting drill
- 侧面钻孔 侧向探眼 超前探眼: flankhole
- 超前探测: drift boring
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超前探水钻孔的英文
发音:
- cover hole
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