我们到得及时，赶上了火车。（《剑桥中阶》）
有一位中阶经营主管因为听了他的医师指示必须要做一些运动。
A middle management executive has to take on some sports, by his doctor's.
在此方程中，弥散项和对时间的导数为分数阶导数所代替。
In this equation, the diffusion is a fractional order derivative of time and space.
利用像素邻域的三阶中心矩，可以提取图像边界。
Image edge is detected by the third central moment of its immediate pixel neighborhood.
在动态分析中，计算出了塔架前五阶固有频率。
In dynamic analysis, the natural frequency is given from the first mode to fifth mode.
在别的坐标系中，它除了包含对时间的二阶微商外，还可能会包含对时间的一阶 微商。
In other coordinates it will involve second and possibly first derivatives with respect to time.
在别的坐标系中，它除了包含对时间的二阶微商外，还可能会包含对时间的一阶 微商。
In other coordinates it will involve second and possibly first derivatives with respect to time.
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