Threshold rattling speed not only depends upon the frequency and amplitude of the errors of a gear pair, but also time-varying meshing stiffness and their combination frequency.

齿面误差对拍击门槛转速的影响不仅与自身的变化频率、幅值大小有关，更重要的是与时变频率及其组合频率有关。

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Goldsmith said that most second-generation, or 2G, cell phones use a combination of time division and frequency division.

戈德史密斯说，大多数第二代手机或2G手机采用时间划分和频率划分相结合的方式。

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Then use RUNSTATS to monitor the level of disorganization of the data, and in combination with your desired frequency of running REORG, adjust the PCTFREE up or down as necessary.

然后使用RUNSTATS监控数据失序的程度，再考虑您期望运行REORG的频率，对PCTFREE进行必要的上下调整。

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The reduced supply of credit is contributing to recessionary fears that are greater in America than in the rest of the world, because the American consumer faces an unusual combination of difficulties, says Ian Shepherdson of High Frequency Economics, a research firm.

ECONOMIST: Business and the credit crunch

The combination of the speedy response of the touchscreen panel and the FAST (Frequency Acceleration Sensor Technology) AF system, the same technology that made the Olympus OM-D the world's fastest autofocusing camera, gives users the power to capture precisely the image they want at precisely the moment they want it.

ENGADGET: Olympus E-PL5 and E-PM2: Micro Four Thirds cameras with OM-D-like focusing, performance boosts (hands-on)