A reddish - brown phosphate mineral containing rare - earth metals(Ce,La,Y,Th)PO4,important as a source of cerium and thorium.是什么意思_A reddish - brown phosphate mineral containing rare - earth metals(Ce,La,Y,Th)PO4,important as a source of cerium and thorium.在线翻译_英语_读音_用法_例句