根据模态分析理论，我们很容易说明为了估计一个系统的所有阶模态，只需要一个参考点—至少从理论的角度来看！
From modal analysis theory, we can easily show that only one reference is necessary in order to determine all of the modes of a system - at least from a theoretical standpoint!
工作目录是指在计算机操作系统中，在目录树内用参考点的一种目录。
Working directory is a directory used as a reference point within a directory tree in a computer operating system.
系统采用了筛选计量采样图像的方法，排除了测量基准参考点选择不当的测量误差。
Using the sieving to calculate the samples of image, the system can remove the error when chooses the unapt basic testing reference.
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