helical cutting

例句：

1. 1. Helical cutting is a crucial technique in the manufacturing process.
   螺旋切割是制造过程中至关重要的技术。
2. 2. The engineer used a helical cutting machine to cut the metal.
   工程师使用一台螺旋切割机来切割金属。
3. 3.During the construction phase, helical cutting was used to level the ground.
   在施工阶段，螺旋切割被用来平整地面。