工人们用挖泥船清理河底的淤泥。

Workers used a ___dredge to remove mud from the river bottom.

他努力回想，试图从记忆深处挖出那个被遗忘的名字。

He tried hard to ___dredge up the forgotten name from the depths of his memory.

工人们正在疏浚港口以便大型船只能够停靠。

Workers are ___dredging the harbor to allow large ships to dock.