Grey model are used to predict the tourists behavior.
用灰色系统对未来旅游者的行为进行了预测。
A study on the behavior of tourists from Europe and America based on market research;
通过对无菌包装的市场调查，对其结果进行分析，进一步阐述了国内外无菌包装的现状。
A study on the behavior of tourists from Europe and America based on market research;
通过对无菌包装的市场调查，对其结果进行分析，进一步阐述了国内外无菌包装的现状。
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