理论上讲：DVD的1倍速是1353KB/s，CD是150KB/s，DVD的1倍速大约等于CD的9倍。
在产品性能方面，CD-R刻录为16倍速、24倍速(Z-CLV)；CD-RW刻录10倍速；DVD+R刻录 8倍速；DVD+RW刻录达4倍速。它的CD-ROM读取速度是32倍速，DVD-ROM读取速度12倍速。
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Mozilla的10倍速或两倍速到底如何精确呢？
How exactly does Mozilla come up with figures like ten times as fast or twice as fast?
公交车是一个当你在追赶它时它能以两倍速度前进的交通工具。
A bus is a vehicle that runs twice as fast when you are after it.
欧洲和美国都是以双倍速度在增长，尽管这两地的市场并不景气。
Europe and US both grew in double digits despite both markets contracting overall.
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