jī / dài / xìn / hào / xū / yào / jīng / guò / tiáo / zhì / cái / néng / zài / gāo / pín / xìn / dào / zhōng / chuán / shū

基带信号需要经过调制才能在高频信道中传输。

Baseband signals need to be modulated before they can be transmitted over high-frequency channels.