短語詞組短語secondary sulphide zone 次生硫化物帶oxidation zone of sulphide deposits 硫化物鑛牀氧化帶oxidized zone of sulphide deposit 硫化物鑛牀氧化帶secondary enriched zone of sulphide 硫化物鑛牀次生富集帶 返回 sulphide zone