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。
提出状态表倍速检测算法。
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?
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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