Bandwidth describes the instrument's ability to respond to time varying signals over a range of frequencies.

带宽说明了仪器在某一频率范围内响应时变信号的能力。

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A-operator method (AOM) is used to study the influence of the speed ratio and time varying meshing stiffness on rattling threshold speed of the gear system.

用算符分解算法(AOM)得到了系统的近似解析解，并研究了传动比和时变啮合刚度对拍击门槛转速的影响。

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If one or more parameters, or the very form of an elemental equation, vary in a known fashion with time, the system is said to be time-varying.

如果有一个或多个参数，甚至连基础方程本身都以一种已知方式随时间而变化，则此系统就称为时变系统。

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"Character and personality changes are fairly pervasive with motor vehicle accidents, " he said, but added that the brain was changeable or "plastic" and repaired itself over time to varying extents.

BBC: Slow, difficult period to come

Shu noted that statins can cause gastrointestinal discomfort and over time may cause varying degrees of liver damage.

CNN: Kids and cholesterol: What to do when the numbers are high

Even giants like Lucent Technologies have a hard time coping with wildly varying order volumes that can rise or plunge 80% from one month to the next.

FORBES: Leveling the playing field