backdigger

例句：

1. 1.The backfiller was used to fill in the gaps in the wall.
   回填剂被用来填补墙壁的缝隙。
2. 2.The backfiller was used to repair the damaged area.
   回填剂被用来修复受损的区域。
3. 3.The backfiller was used to level the ground before construction began.
   回填剂被用来在施工开始前平整地面。