n.演練；鉆孔
Mock drilling is a usual way in teaching of the major of management. 模擬演練是管理類專業(yè)教學(xué)中的常用方法。
After months of drilling, oil was found off the coast. 經(jīng)數(shù)月鉆探，在沿海找到了石油。
The workman is drilling in the wall. 工人正在墻上打孔。
