单词	niobiums
释义	同niobium
随便看	open-pit crawler downhole jumbo open-pit crawler rig open pit development open-pit development open-pit drill wagon open pit mining open-pit mining open-pit quarry open plan open-plan open plan school open platform open plug open pneumothorax open policy open policy--blanket policy open policy {= o.p.} open-pollinated open pollination open-pollination open polygon open-pool open-pool reactor open population open pore