Cerium

[siәriәm]

解释:

(noun.) a ductile grey metallic element of the lanthanide series; used in lighter flints; the most abundant of the rare-earth group.

约翰校对--From WordNet

解释:

(n.) A rare metallic element, occurring in the minerals cerite, allanite, monazite, etc. Symbol Ce. Atomic weight 141.5. It resembles iron in color and luster, but is soft, and both malleable and ductile. It tarnishes readily in the air.

康妮手打

解释:

n. a rare metal found in the mineral Cē′rite which is its hydrated silicate.

艾琳校对