ADSL is a branch of DSL technology, but also the use of ordinary telephone lines to transmit data, but it is used in high frequency band than the voice.
ADSL是DSL技术的一个分支，同样也是使用普通电话线路来传输数据，但它使用的频率要比语音波段高。
Advertisers electronically vary voice sounds so that they stay within such a frequency band.
广告人通过电子手段改变声音使其始终处于该频段内。
Advertisers electronically vary voice sounds so that they stay within such a frequency band.
广告人通过电子手段改变声音使其始终处于该频段内。
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