noun 下载 🔗分享 红玉髓,玛瑙 A hard, reddish brown chalcedony; used in jewelery, Examples : "The antique necklace featured a smooth, oval carnelian as its centerpiece. " 那条古董项链的中心装饰是一颗光滑的椭圆形红玉髓. material geology mineral color 与AI对话词汇游戏阅读练习