疏浚机

例句：

1. 1.The dredger was used to clear the riverbed of debris.
   疏浚机被用来清除河床的杂物。
2. 2.The dredger operator carefully monitored the water level and depth.
   疏浚机操作员仔细监测水位和深度。
3. 3. The dredger was essential for maintaining the navigation channel's integrity.
   疏浚机对于保持航道完整性至关重要。