placer mining
短語詞組
- gold placer -mining 採金場
- placer gold mining 砂金鑛開採
- placer r mining 砂鑛淘採
- beach placer mining industry 海濱砂鑛開採業(yè)
- beach placer mining 海濱砂鑛開採
- method of littoral placer mining 濱海砂鑛開採法
- hydraulic mining of placer 砂鑛露天水力開採 返回 placer mining