The Design of Dredging Device for Bucket Dredger
链斗式挖泥船挖泥装置的设计
a dredging bucket with hinges like the shell of a clam
有像蛤壳一样的铰链的挖泥的桶
a dredging bucket with hinges like the shell of a clam.
有像蛤壳一样的挖泥的桶。
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