n.扩散性；扩散系数
Solubility and diffusivity are two key factors in the description of mass transport. 溶解性和扩散性是描述溶剂在高分子中传质现象的两个关键因素。
The turbulent mass transfer diffusivity profile was also obtained by the simulation. 通过模拟，同时得到了湍流传质扩散系数的分布。
