The fundamental problem in the establishment and solution to the spatial vibration equation of train-track (bridge) time-varying system at home and abroad is analyzed in detail.
分析了国内外在列车-轨道（桥梁）时变系统空间振动方程的建立及其求解过程中存在的根本问题。
A simple method for the orthogonal fundamental solution of homogeneous linear equation system and the example in its application are given.
给出了求齐次线性方程组正交的基础解系的一个简便方法和一个应用实例。
Relied on previous data, the general expression of displacement fundamental solution for three-dimension bi-materials under coordinate system oblique to interface is given.
利用已有的三维双相材料位移基本解，给出了在与界面斜交坐标系下位移基本解的一般表达式。
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