Learn English free online - how to pronounce word in English - English Learning Online- www.pronounceword.com
atomic number 68
n.
a trivalent metallic element of the rare earth group; occurs with yttrium
同义词:
erbium
Er
网络释义
短语
专业释义
英英释义
atomic number 68
n.a trivalent metallic element of the rare earth group; occurs with yttrium 同义词:erbiumEr
英汉双解大词典