说明：  灰色预测法是一种对含有不确定因素的系统进行预测的方法。灰色预测是对既含有已知信息又含有不确定信息的系统进行预则，就是对在一定范围内 变化的、与时间有关的灰色过程进行预测。
(Grey forecasting method is a kind of forecast systems containing uncertainties of the method. Grey prediction is to contain both known letter, interest rates and is the system containing uncertain information, is to change within a certain scope, time dependent process of grey forecast.)