最后，使用灰色系统模型对彩票业与宏观经济的关系作了关联分析。
At last, a grey system model is used to show the relevancy between lottery industry and macro-economy.
研究表明，灰色系统模型在环境科学研究中可以作为一种新的认识方法。
It was showed that the grey system model may be used as a new tool in environmental scientific research.
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.
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