straight-flute drill

例句：

1. 1.This straight-flute drill is perfect for drilling through concrete.
   这种直型钻头非常适合钻透混凝土。
2. 2.The engineer used a straight-flute drill to make the hole in the wall.
   工程师使用直型钻头在墙上打了一个洞。
3. 3. The straight-flute drill was the only tool that could penetrate the thick steel plate.
   直型钻头是唯一一个能够穿透厚钢板的工具。