annular borer

例句：

1. 1. The engineer used a circular saw to cut the metal sheet into annular shapes.
   工程师使用圆锯将金属板材切割成环形形状。
2. 2. The technician performed a series of operations using an annular borer to remove the damaged part.
   技术人员使用环形钻头执行了一系列操作，以移除损坏的部分。
3. 3. The tool was designed to facilitate the removal of materials from the center of an annular hole.
   该工具旨在便于从环形孔的中心移除材料。