挖泥船

例句：

1. 1. The dredger was used to remove the sand from the riverbed.
   挖泥船被用来从河床上移除沙子。
2. 2. The dredger was a crucial tool for maintaining the water quality in the harbor.
   挖泥船是维护港口水质的关键工具。
3. 3. The dredger was used to clear the channel for navigation.
   挖泥船被用来清理航道以供航行。