... telephone sound quality电话音质 Relay station中继站 root causes根本原因 ...
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telephone sound quality
电话音质
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Mobile carriers now have the ability to improve sound quality by transmitting it over their 4G LTE networks, as opposed to the more limited telephone lines of the past.
CNN: Coming to your phone: High-definition voice
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