top and bottom saw

例句：

1. 1. The top saw was used to cut the wood into pieces.
   顶锯被用来把木头切成块状。
2. 2.The bottom saw was used to shape the wood.
   底锯被用来成型木材。
3. 3. Top and bottom saws are essential tools for cutting and shaping wood.
   顶锯和底锯是切割和成型木材的重要工具。