1. Not enough is known about these forces to yield acourate theoretical expressions for the virial coefficients.
   要想的維里彈性系數的正確概念表達出來式，人們還匱乏更多這類力的有足夠的知識。
2. The third virial coefficients of humid air are estimated with the equation of corresponding state with four characteristic parameters.
   對水室內空氣壓縮和濕室內空氣的第四維里指數也來進行了預測算。