灰色系统预测模型的本质是对已知数据序列进行类型为指数形式的曲线拟合，然后将此曲线延伸到未来，由此对未知的数据做出预测。
The essence of the gray prediction model is to fit the known data sequence with an exponent form to a curve, and then extend the curve to the future in order to predict the unknown data.
在林业生产实践中，用灰色系统模型预测人工林材积生长率有其适用价值。
It is worth while to apply the gray system model to predict the forest growth in practice.
现有六种油气田动态预测的灰色系统模型，但在实际应用中需要根据具体油气田选择适当的模型。
There are six grey models of dynamic prediction of oil and gas fields, but an appropriate model should be selected according to a certain oil or gas field in practice.
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