平面铣刀

例句：

1. 1. The engineer used a planar milling cutter to smooth the surface of the metal.
   工程师使用一个平面铣刀来平滑金属的表面。
2. 2. The technician was tasked with removing the old planar milling cutter and installing a new one.
   技术人员被指派去更换旧的平面铣刀并安装新的。
3. 3. The machine shop had to replace the damaged planar milling cutter due to its poor performance.
   机床车间不得不更换损坏的平面铣刀，因为它的性能不佳。