under-reaming

英 ['ʌndərr'iːmɪŋ] 美 ['ʌndərr'iːmɪŋ]

• 扩孔

under-reaming的用法和样例：

例句

1. 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。
2. 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。