名词稀土元素
1. 稀土元素：lanthanide series 稀土属元素 | lanthanon 稀土元素 | lanthanum 镧
2. 镧系元素：lanthanite 镧石 | lanthanon 镧系元素 | lanthanumLa 镧
3. 镧：镧 lanthanium | 镧 lanthanon | 拉卜拉变换;拉卜拉士换式 Laplace transformation
noun
1. any element of the lanthanide series (atomic numbers 57 through 71)
Synonym: rare earth rare-earth element lanthanoid lanthanide