用一些特殊的专孔方法从洞里挖掘岩石来提取样品。
Cores- samples of extracted rock from the holes using some special method of drilling.
科学家们曾为这些精心打磨、常现淡红色的砾岩石刃石斧所迷惑，这些器具是从南非海滨的史前遗址挖掘出来的。
Scientists had been puzzled by the fine-grained and often reddish coloured silicate blades and axes excavated from prehistoric sites at Pinnacle Point on the South African coast.
这个阶梯状的船闸延绵5公里（3英里），深度达9米（30英尺），整体都在在岩石上挖掘出来的，后来这里形成了一个小城镇——船闸渡口镇（Lockport）。
The staircaselike locks were followed by a 5-km- (3-mile-) long, 9-metre- (30-foot-) deep cut blasted into the rocky plateau. The town that grew at this site was appropriately named Lockport.
应用推荐