It adds time delay to the controlling system that can control the time delay system inerrably and overcome the shortcomings of the traditional approximation method.

该方法将间后因子自然纳入系统控机，可完全无实现对系统控，克服了传统近似法解所带来问题。

Besides, We indicated the main adavantages of this means and probable way of overcoming its shortage, that is, method of difference value of isoporic lines is used to process data of some stations.

另外,文中指出了该手段主要优点及克服其缺点可能途径,即有些台站可采用地磁等变线值法处理。