太阳能电话：以太阳作能源的无线电话已在一家无线电公司问世。它利用顶端上装的太阳能接受板，可以不断给电池充电。使用者的声音通过无线电波输入附近的电话交换机，再传送到各地电话通讯网去。巴黎伏得瓦特公司制作的太阳能收费公用电话耗电量极低，只要在阳光下充电几... Solar Phones: Wireless phones that use the sun as an energy source have been introduced to a radio company. It utilizes a solar receiver board mounted on the top to continuously charge the battery. The user’s voice is input via a radio wave to a nearby telephone exchange and then transmitted to the local telephone communications network. The solar-charged public telephones made by Paris Volvote have very low power consumption, as long as they are charged in the sun...