2011年4月7日，纽约，被称作“沙狗”的隧道挖掘工人从第二大街地铁建筑工程的北向的隧道的隧道掘进机中走出。
A subway construction worker, known as a "sandhog" exits the tunnel boring machine in the northbound tunnel of the Second Avenue subway construction project, Thursday, April 7, 2011 in New York.
天井钻进法是我国矿山于80年代推广应用的天井掘进新方法。
The raise boring is a new raising method deployed in China's mines in1980s.
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