单词	man-made element
释义	man-made element 人造放射性元素
随便看	layered pavement layered permafrost layered perovskite layered-perovskite layered perovskite manganate layered perovskite manqanese oxide layered perpursor layered phosphotoantimonic acid layered pile layered pills layered planning Layered plate-girder element layered-policy layered polymer membrane Layered porous media layered porous medium layered positioning layered positive material layered potassium titanate layered power supply tree layered precursor layered process enactment mechanism layered product layered product essentially comprising asbestos layered product essentially comprising bitumen