如今,老天爷的脾气越来越坏,要么冷得要死,要么热得要命。当然,人是万物之灵,还是有办法对付的。就拿天热来说吧,过去是靠摇蒲扇凉快;现在有了电风扇、空调器,降温消暑更不成问题了。可是,开空调费电耗能多,相对来说,还是用电风扇比较节约。19世纪80年代,德国人惠勒把风扇的叶片装在电动机上,用电力使风扇转 Nowadays, God’s temper is getting worse and worse, either cold to death or hot. Of course, people are the spirit of all things and there are ways to deal with them. Let’s take hot weather. In the past, it was relying on the fan to cool the fan. Now that you have an electric fan and an air conditioner, it is not a problem to cool down. However, the air-conditioning charge consumes more energy, and relatively speaking, it is more economical to use an electric fan. In the 1880s, the German Wheeler mounted the blades of the fan on the electric motor and used electricity to turn the fan.