本文利用灰色系统对土石坝沉陷进行了预测，绘出了灰平面，经后验差检验，预测精度达到一级。
In this paper, dam subsidence is forecasted by means of the grey system theory, and the grey plane is mapped. Variance tests show that the forecasting accuracy is good.
灰色预测是灰色理论的主要内容之一，其中数列灰预测是灰色预测的主要类型之一。
Grey prediction is one of the main ideas of grey theory. The sequence grey prediction is one of major type of grey prediction.
通过建立造价指数的灰色系统预测模型可以算出未来造价指数的灰元值和进行短期、中期和长期的预测。
The grey element value of cost index would be figured out by way of establishing cost index′s presumption model that is a grey system.
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