换句话说，他必须用电波来代替传送我们当面谈话的无线电波。
In other words, he would have to substitute electrical waves for the air waves on which our voices are carried in face to face conversation.
换句话说，他必须用电波来代替传送我们当面谈话的无线电波。
In other words, he would have to substitute electrical waves for the air waves on which our voices are carried in face to face conversation.
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