Thulium

[θju:liәm]

解释:

(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--From WordNet

解释:

(n.) A rare metallic element of uncertain properties and identity, said to have been found in the mineral gadolinite.

克拉拉录入