drilling ['drɪlɪŋ]

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附加级

n.演练v.钻（孔）( drill的现在分词 )；打（眼）；操练；训练

exploratory drilling for oil 钻井勘探石油
After drilling for several weeks they finally struck oil. 在钻探了几个星期后，他们终于发现了油矿。来自《简明英汉词典》