1、Then, using special drill hole in the bumper, and detectors were put into holes.
然后，用專用鉆頭在保險杠上開孔，并將探測器別離裝入孔內(nèi)。

2、The special drill press for the stand pillar is introduced.
介紹了一種高速公路護欄立柱專用鉆床。

3、Maybe use this as a special drill with less people.
這個練習可能對很少的人有用。

special drill翻譯