Alexander Graham Bell develops the photophone which uses sunlight to carry messages. It was never commercially produced.
亚历山大.格雷
.
尔利用太阳
开发电话用于传输信息。这种电话从未用于商业生产。
·尔（电话发明者）Alexander Graham Bell develops the photophone which uses sunlight to carry messages. It was never commercially produced.
亚历山大.格雷.尔利用太阳开发电话用于传输信息。这种电话从未用于商业生产。
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