saddle stitching machine

例句：

1. 1. The saddlestitching machine is used to sew saddles together.
   鞍缝机用于将鞍子缝合在一起。
2. 2. The saddle stitching machinewas invented by a man named John Smith.
   鞍缝机是由名叫约翰·史密斯的男子发明的。
3. 3. The saddle stitchingmachine has become an essential tool in thesaddler's workshop.
   鞍缝机已成为鞍匠工作室中不可或缺的工具。