tourmaline
/`tʊrmәˏlin/
n.
A mineral that is usually black, but sometimes red, blue, green, or, rarely, colorless: often used as a gem.
电器石。
青年旅行网英语在线翻译词典收录了86352条英语词汇在线翻译词条，基本涵盖了全部常用英语词汇的中英文双语翻译及用法，是英语学习的有利工具。