同时，我们还研究了取代基团的电子效应和位阻效应对反应产率和区域选择性的影响。
At the same time, we have also investigated the influence of the electric effect and steric hindrance effect of the substituents to the yields and regioselectivity.
水凝胶中扩散理论模型主要有自由体积模型、流体力学模型、位阻效应模型三大类；
The theoretical models consist of three categories: free volume, hydrodynamic, and obstruction effect models.
水凝胶中扩散理论模型主要有自由体积模型、流体力学模型、位阻效应模型三大类；
The theoretical models consist of three categories: free volume, hydrodynamic, and obstruction effect models.
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