effective diffusivity

例句：

1. 1.The new model has a higher effective diffusivity than the old one.
   新模型的扩散率比旧模型高。
2. 2.In order to improve the effectiveness of our marketing strategies, we need to analyze the data more thoroughly.
   为了提高我们营销策略的有效性，我们需要更深入地分析数据。
3. 3. The research team found that the effective diffusivity of the material was significantly reduced after exposure to sunlight.
   研究团队发现，该材料在暴露于阳光后其有效扩散率显著降低。