亚历山大．葛拉罕．比尔 (Alexander Graham Bill) 在1880年6月3日发明了光影电话 (photophone)

你可能知道电话是用电来传递声音通讯。但是，你可能不知道发明电话的人，也就是亚历山大．葛拉罕．比尔 (1847-1922) 还有另外一项用光线来传递声音的发明。他把这项发明称为 光影电话。


You may know that a telephone uses electricity to send voice communications. However, you may not know that the man who invented the telephone, Alexander Graham Bell (1847-1922) had another invention that used light to transmit sound. He called it the photophone.

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