在19世纪早期,煤气灯得到推广之前,夜晚的城市街道一直是黑暗且危险的地方。过去的人们想让家里变得明亮并不是一件容易的事情。蜡烛太贵,油灯会发出臭味,而煤气灯会释放浓烟,污染家具并杀死盆栽植物!19世纪70年代,有两个人分别开始着手发明一种廉价、清洁、可通过轻按开关控制的照明工具——电灯泡由此出现了。 Before the gas lamps were promoted in the early 19th century, the night city streets were always dark and dangerous places. It is not easy for people in the past to make their home brighter. The candles are too expensive, the oil lamps emit a stench, and the gas lamps emit smoke, pollute the furniture and kill potted plants! In the 1870s, two men started to invent a cheap, clean, light-weight switch Lighting Tools - light bulb appeared.