如果当△x→0时，△y/△x有极限，我们就说函数y=f(x)在点x0处可导，这个极限叫做f(x)在点x0处的导数（即瞬时变化率，简称变化率）
通过计算液晶盒中的瞬时指向矢分布，得到光透过率随时间变化与扭曲角之间的关系。
The relation of the transient transmittance and the twist Angle is obtained by calculating the instantaneous distribution of the director in this mode.
如果把瞬时频率作适当的非线性变化，就可以得到一个以地层衰减率的倒数的平均值为输入的频谱。
If a proper non - linear change of the instantaneous frequency is realized, we can get a frequency spectrum whose input is the mean of the reciprocals of bed attenuation coefficients.
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