After 15 years of construction work, the 9.5-meter (31-foot) wide drilling machine will bore through the remaining 1.5 meters of rock to join two ends of the tunnel some 2,000 meters under a mountain.
经过15年的施工，9.5米宽的钻孔机将会钻穿最后剩下的1.5米的岩层，联通了位于山体下2000米的隧道两端。
Pneumatic drifter is a new short distance and small bore underground construction machine.
气动穿孔机是一种新型短距离、小直径地下施工机械。
The using of bore bottling pile is quite popular in construction, but as a concealed work, the quality check after its completion is more difficult.
钻孔灌注桩目前在施工中的使用已相当普及，但因属隐蔽工程，成桩后质量检验比较困难。
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