The specular reflection is a very important linear transformation in Euclidean space, and it has a special geometrical explanation in geometrical space. 摘要镜面反射是欧氏空间中一类很重要的线性变换，在几何空间中有着极其形象的解释。
The original system with both input and state time delays was first rewritten into a form without any time delays by a nonsingular linear transformation. 为了简化变结构控制器的设计，首先通过非奇异线性变换将含状态时滞和输入时滞的线性系统化为无时滞系统。
