短语词组短语iron -sand 铸铁砂iron coated sand 涂铁砂cubic iron ore sand 立方体状铁矿砂marine iron ore sand dredger 海上铁矿砂开采船Low - iron silica sand 低铁硅砂magnetic iron sand 磁铁矿砂iron sand deposit 铁沙矿iron sand tailing 铁砂尾矿 返回 iron sand