trepanation and drainage

例句：

1. 1. Trepanation and drainage are essential procedures inneurosurgery.
   在神经外科中，开颅手术和引流术是必要的程序。
2. 2. The patient required immediate drainage after thetrepanation.
   患者需要在开颅手术后立即进行引流。
3. 3. Trepanation and drainagecan be performed under local anesthesia.
   开颅手术和引流术可以在局部麻醉下进行。