drill edge

例句：

1. 1. The drill bit was worn down to the drill edge.
   钻头已经磨损到了钻头边缘。
2. 2.The company's cutting edge technology has attracted many investors.
   该公司的尖端技术吸引了许多投资者。
3. 3.The engineer used a diamond drill bit to cut through the concrete.
   工程师用钻石钻头切割混凝土。