Actinium
[æk'tɪnɪəm]
解釋/意思:
(noun.) a radioactive element of the actinide series; found in uranium ores.
編輯:威尔玛--From WordNet
解釋/意思:
(n.) A supposed metal, said by Phipson to be contained in commercial zinc; -- so called because certain of its compounds are darkened by exposure to light.
校對:卢埃林