用英语描述一样物品 相当于让人猜 猜谜.

an important item installed inside everyone's home,turning it on at night,that will help you to see thing clearly,turning it off at night,it will become totally darkness inside your home.people can't live without it at all .it was invented by the greatest inventor in the world hundred years ago,after i came out,it has brought numerous helps for all human being .it is.
一个很重要的东西,每个人家里都有,打开它的时候,它可以帮助人能看清楚东西.关上它的时候,家里就会完全变成漆黑.现在的人们已经不能离开它的帮助了.它是被世上最伟大的发明家在一百多年前发明的,自从它被发明以后,它为全世界的人们带来了福祉.它是.
答案：电灯.the light.