virial coefficient的用法和样例：
例句
- Not enough is known about these forces to yield acourate theoretical expressions for the virial coefficients.
要想得到维里系数的准确理论表达式，我们还缺乏关于这些力的足够知识。 - The third virial coefficients of humid air are estimated with the equation of corresponding state with four characteristic parameters.
对水蒸汽和湿空气的第三维里系数也进行了预估计算。
