inverted jig

例句：

1. 1.He used an inverted jig to make the cut perfectly straight.
   他用倒立锯做了一个完美的直切。
2. 2. The carpenter was using an inverted jig to make a precise cut.
   木匠正在用倒立锯做一个精确的切割。
3. 3.The inverted jig helped him achieve the perfect angle for the project.
   倒立锯帮助他实现了项目的完美角度。