非贵金属
非贵金属超微粒子
Here is a variety of unprecious pairings of tables and mirrors from a range of eras that will yield a vanity that's anything but vain.
WSJ: The Un-Vain Vanity Table
unprecious:
un- +? precious
英汉双解词典包含3185865条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。