... 一阶值：first-order value 一阶时间导数：first time derivative 一阶马尔柯夫过程：first-order Markov process ...
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first-time derivative 一次时间导数
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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