impeller ramming

例句：

1. 1. The engineer used an impeller ramming to remove the blockage in the pipeline.
   工程师使用推进器撞击来清除管道中的堵塞。
2. 2. During the construction of a new bridge, impeller ramming was used to reinforce the foundation.
   在建造新桥的过程中，使用了推进器撞击来加固地基。
3. 3. The impeller ramming system is designed to efficiently clear debris from the airway.
   推进器撞击系统设计用来高效地清除空气通道中的杂物。