VOA常速英语:RMS泰坦尼克公司想要打捞沉船里的无线电报机

They say after all these years underwater, time is running out to dredge the Marconi wireless Telegraph machine, that transmitted the Titanic’s frantic distress calls.

Dredge 清淤; 挖掘
Police have spent weeks dredging the lake but have not found his body.
警察已经花了几周时间在湖里打捞，但是仍未发现他的尸体。