我会计算时间导数。
And so we're going to take the derivative versus time of this equation.
我们要求这个，方程的时间导数。
That's the first derivative of the position versus time.
它就是位置，对时间的一阶导数。
In this equation, the diffusion is a fractional order derivative of time and space.
在此方程中，弥散项和对时间的导数为分数阶导数所代替。
The second time derivative is the constant acceleration.
它的二阶导数就是这个恒加速度。
The second time derivative is the constant acceleration.
它的二阶导数就是这个恒加速度。
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