backfilling thrower

例句：

1. 1. The engineer used a backfilling hammer to repair the damaged pipe.
   工程师使用回填锤来修复损坏的管道。
2. 2.The backfilling hammer gun was used to fill in the gaps in the wall.
   回填锤枪被用来填补墙壁中的缝隙。
3. 3. The backfilling hammer gun was used to level the ground before the construction began.
   回填锤枪被用来平整土地，以便开始施工。