recarburizer

例句：

1. 1. The recarburizer is used to fill in the gaps between the bricks.
   回填机用于填充砖块之间的空隙。
2. 2.The engineer designed a new type of recarburizer that can improve soil compaction.
   工程师设计了一种新型的回填机，可以提高土壤的密实度。
3. 3.The recarburizer was tested on a small plot of land and found to be effective in reducing erosion.
   回填机在一块小土地上进行了测试，并发现能有效减少侵蚀。