The problem with electrical signals is that they get weaker and weaker as they travel along metal wires.

　
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  • 電信號有個(gè)難解決的問(wèn)題,就是當它沿著(zhù)金屬導線(xiàn)傳送時(shí)信號會(huì )變得越來(lái)越弱。
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