这个关系式有什么意义呢？
By equation we mean a mathematical expression in which the two sides balance.
所谓方程式，是指两边相等的数学式。
In addition, we also derive the mean queue size from another equilibrium equation.
此外，由平衡方程得到系统的平均队长。
In addition, we also derive the mean queue size from another equilibrium equation.
此外，由平衡方程得到系统的平均队长。
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