drill guide layer 钻孔导引层
Drill Drawing Layer 钻孔绘图层 ; 钻孔图层
internal doublerun drill granular layer 内颗粒层
multi-drill small-diameter deep-layer mixing pile 多头小直径深层搅拌桩
In the "Layer", load in all the signal & drill layers.
选择所有的信号层和钻孔层。
Assemble drill to break through the first layer of crust, the crew deploys a steel pipe with an 11-inch-wide drill bit at the bottom.
为了突破第一层地壳，船员们使用底部装有11英寸宽的钻头的钢管。
This year, a huge circular bore is to be lowered into a layer of sand deep beneath the city, where it will drill a tunnel to link them.
今年，就要在城市地下深处的砂层打通一个巨大的圆形隧道，把地铁站连起来。
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