hollow-backed saw

例句：

1. 1.This hollow-backed saw is very efficient at cutting through thick wood.
   这种空心背锯在切割厚木头时非常高效。
2. 2.The hollow-backed saw was a popular tool in the 19th century.
   空心背锯是19世纪流行的工具。
3. 3.The hollow-backed saw was used to cut down trees for firewood.
   空心背锯被用来砍伐树木制作柴火。