单词：under-reaming
扩孔
under-reaming的用法和样例：
例句
- One technique is to use power reaming to penetrate the first cortex and then switch to hand reaming.可以用电钻突破第一层皮质，然后换成手摇钻扩孔。
- The effects of water jet parameters and drill motion parameters on the soil reaming were investigated by an indoor test.通过实验，研究了射流参数和钻杆运动参数对扩孔效果的影响。
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