(noun.) a soft silvery metallic element of the rare earth group; isotope 170 emits X-rays and is used in small portable X-ray machines; it occurs in monazite and apatite and xenotime.
录入:莫伊拉
双语例句
Samarium discovered by Boisbaudran, Scandium by Nilson, and Thulium by Cleve. Edward W. Byrn.十九世纪发明进展.