bulb：n. 电灯泡；鳞茎；球状物 vi. 生球茎；膨胀成球状
例句：Edison tried 1, 600 materials before settling on carbonized cotton fiber as the filament for his electric light bulb.
句意：爱迪生尝试了1600种材料，最后选定碳化棉纤维作为电灯泡的灯丝。