1. to dredge the sand,silt and mud from the river bottom 从河底挖掘砂石、泥沙和淤泥
2. The hydraulic system is a guarantee for the various functions of a dredge. 采砂船液压系统是采砂船各项功能顺利实现的保证。
3. We should have the dredge, barges and draglines in place about the same time. 差不多要在同时使挖泥机，驳船和索斗铲各就各位。
英英解释
n.
1. a power shovel to remove material from a channel or riverbed
2. cover before cooking
3. search (as the bottom of a body of water) for something valuable or lost
4. remove with a power shovel, usually from a bottom of a body of water
