We can't use the local variable technique if an instance of the parent component class must read or write child component values or must call child component methods.
如果父组件的类需要读取子组件的属性值或调用子组件的方法，就不能使用本地变量方法。
A supplementary variable technique is used to obtain the steady-state function and the steady-state probability generation function of the number of customer in the system.
本文采用补充变量法，首先建立了系统稳态下的状态转移方程，通过求解得到了稳态下系统队长的概率母函数，进而计算出稳态下系统的平均队长。
A supplementary variable technique is used to obtain the steady-state function and the steady-state probability generation function of the number of customers in the system.
采用补充变量法，首先建立了系统稳态下的状态转移方程，通过求解得到了稳态下系统队长的概率母函数，进而计算出稳态下系统的平均队长。
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