Most textbooks come with an audio CD that never even gets taken out of the package.
大多数课本都带有一张CD盘，几乎没有人把它从包裹里取出过。
Conforms to standard audio CD specification.
符合所有CD数字音频规格。
Incidentally, the difference in price for the audio CD-R blanks is due to licensing agreements and volume.
顺便提一句，“音乐专用”盘片的价格差异是由产量和授权协议决定的。
Incidentally, the difference in price for the audio CD-R blanks is due to licensing agreements and volume.
顺便提一句，“音乐专用”盘片的价格差异是由产量和授权协议决定的。
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