Incandescent light bulbs, introduced in the late 1870s, are slowly being displaced in the developed world by more energy-efficient light-emitting diodes (LEDs), in applications from traffic lights to domestic lighting.
Incandescent light bulbs, introduced in the late 1870s, are slowly being displaced in the developed world by more energy-efficient light-emitting diodes (LEDs), in applications from traffic lights to domestic lighting.
在发达国家里，从交通信号灯到家用照明灯，节能型LED灯正慢慢地取代19世纪70年代末引进的白炽灯。