Alexander Graham Bell develops the photophone which uses sunlight to carry messages. It was never commercially produced.
亚历山大.格雷厄姆.贝尔
阳
开
话于传输信息。这种话从未于商业生产。
话明者）Alexander Graham Bell develops the photophone which uses sunlight to carry messages. It was never commercially produced.
亚历山大.格雷厄姆.贝尔阳开话于传输信息。这种话从未于商业生产。
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