而所做预测的误差容限是否足够小，从而使得这个预测还算有用，这完全是另外一码事。
Whether the prediction has a small enough error margin to be useful is another matter entirely.
对双随机相位加密过程进行了计算机模拟，并对该技术的误差容限进行了分析与模拟。
Double random phase encryption technique is simulated, its faulty tolerance is also analyzed and results of simulated experiments are given.
同时，本文还计算出了这几种参数的误差容限，这对体积相位全息光栅的实际制作具有指导作用。
Furthermore, the paper offers the error limited of these parameters and they are good to guide practical fabrication of the volume phase holographic grating.
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