Alexander Graham Bell develops the photophone which uses sunlight to carry messages. It was never commercially produced.
大.格雷厄姆.贝尔利用太阳光开发光电用于传输信息。这种光电从未用于商业产。
Alexander Graham Bell develops the photophone which uses sunlight to carry messages. It was never commercially produced.
大.格雷厄姆.贝尔利用太阳光开发光电用于传输信息。这种光电从未用于商业产。
声明:以上例句、词性分类均由互联网资源自动,分未经过人工审核,其表达内容亦不代表本软件的观点;若发现问题,欢迎向我们指正。