hollow swage

例句：

1. 1. The hollow swage is used to make holes in metalsheets.
   空心套圈用于在金属板材上打孔。
2. 2. The hollow swagewas designed to reduce the weight of themachine.
   空心套圈的设计旨在减轻机器的重量。
3. 3. The hollow swage is acommon tool for welding and cutting.
   空心套圈是焊接和切割中常用的工具。