英语翻译1.Glass fibres,which are made to carry light signals2.Wh
英语翻译
1.Glass fibres,which are made to carry light signals
2.When the light reaches the other end,it is first changed into electrical signals,which are in turn changed into sound message.
1.Glass fibres,which are made to carry light signals
2.When the light reaches the other end,it is first changed into electrical signals,which are in turn changed into sound message.
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