half-round concave milling cutter

例句：

1. 1. The half-round concave milling cutter is used for cuttingcomplex shapes in metal.
   半圆凹铣刀用于金属中切割复杂的形状。
2. 2. Theengineer designed the half-round concave milling cutter to meet theprecision requirements of the project.
   工程师设计了半圆凹铣刀以满足项目对精度的要求。
3. 3. The half-round concave milling cutter was a significantadvancement in the field of metalworking.
   半圆凹铣刀是金属加工领域的一项重大进步。