a blunt-tipped drill的用法和样例：
- Fin is tall and back-tapered with a blunt tip and fairing in the leading edge.
- The blunt tip of a fencing foil.
- I suffered a blunt refusal when I called him.
- He cut the meat with a blunt knife.
- The king intended to have Hamlet use a blunt sword.
- He was sawing the bread with a blunt knife.