n a soft yellowish-white trivalent metallic element of the rare earth group; can be recovered from bastnasite or monazite by an ion-exchange process
n a self-governing commonwealth associated with the United States occupying the island of Puerto Rico
n a promotion intended to create goodwill for a person or institution
与公众的关系, 公关
[计] 模式识别, 实际记录, 前缀, 程序寄存器