词汇	brown ore
释义	brown ore un.褐铁矿类矿石；沼矿
随便看	principal hydrometric station, base station principali Principali principalia principal idea principal ideal principal ideal class principal ideal domain principal ideal integral domain principal ideal minor ring principal ideal ring principal ideal theorem principal idempotent principal idempotent element principal image components principal image plane principal impact factor principal imports and exports principal-in-charge principal income principal indecomposable left ideals principal indecomposable module principal indexes principal index for extraordinary ray principal indication