virial coefficient的用法和樣例：
例句
- Not enough is known about these forces to yield acourate theoretical expressions for the virial coefficients.
要想得到維里係數的準確理論表達式，我們還缺乏關於這些力的足夠知識。 - The third virial coefficients of humid air are estimated with the equation of corresponding state with four characteristic parameters.
對水蒸汽和濕空氣的第三維里係數也進行了預估計算。
