internal drilling

例句：

1. 1. The company is conducting internal drilling to improve its efficiency.
   该公司正在进行内部钻探以提高其效率。
2. 2.During the drilling process, the engineers were able to identify several potential problems.
   在钻探过程中，工程师们能够识别出几个潜在的问题。
3. 3. Thedrilling operation was completedsuccessfully, and the well wasfilled with oil.
   钻探作业成功完成，井中充满了石油。