Analysis shows this model is able to predict the variation trend of short time traffic flow.
分析表明：该模型较好地预测了短时交通流的变化趋势。
Study the pollutant delivery rule and the reason of the variation trend by environmental geology theory.
运用环境地质学理论研究了污染物运移规律，及造成各种水体水质污染及水质变化趋势的原因。
Objective To study the variation trend in incidence of neural tube defects (NTDs) during 1988 to 1992 in China.
目的了解1988～1992年我国神经管缺陷（NTD）发生率的变化趋势。
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