挖泥机

机

Dredge \Dredge\ (dr[e^]j), v. t. [imp. & p. p. {Dredged}
(dr[e^]jd); p. pr. & vb. n. {Dredging}.]
To catch or gather with a dredge; to deepen with a dredging
machine. --R. Carew.

{Dredging machine}, a machine (commonly on a boat) used to
scoop up mud, gravel, or obstructions from the bottom of
rivers, docks, etc., so as to deepen them.