back reinfored knife saw

例句：

1. 1.The back reinforced saw was used to cut through the tough wood.
   用后盾加固的锯子来切割硬木。
2. 2.The construction workers used the back reinforced saws to clear the debris from the site.
   建筑工人使用后盾加固的锯子清理工地上的杂物。
3. 3. The back reinforced saws were essential for the heavy-duty work that needed to be done on the construction site.
   后盾加固的锯子对于需要在建筑工地上进行的重型工作至关重要。