1. Lacking luster; dull and subdued. 
   无光泽的缺乏光泽的；不鲜明和柔和的
2. Lacking brightness, luster, or vitality; dull. 
   暗淡的、无光泽的或缺乏活力的；不活跃的
3. Any of various volcanic glasses distinguished by their dull pitchlike luster. 
   松脂石某种火山玻璃，以其暗似沥青的光泽而著名
4. A valuable silver ore, Ag2S, with a lead-gray color and metallic luster that is often tarnished a dull black. 
   辉银矿一种有价值的银矿，ag2s，银灰色，具金属光泽，常失去光泽而成为暗黑色
5. Having a changeable luster. 
   具用变幻光彩的

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