... 循环时间；周期 cycle time 一次时间导数 first-time derivative 信号往返时间滞后 signal roundtrip time delay ...
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That's the first derivative of the position versus time.
它就是位置，对时间的一阶导数。
For the first time, derivative distribution of velocity in cell is presented and some new conclusions are obtained.
首次给出了电池内的速度导数分布，得出了一些新的结论。
Some first order time derivative terms are contained in the equations.
方程中含有强迫场的一阶时间导数项。
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