help me polish this paragraph：Due to the transfer function of each stage is dependent on the input voltage attackers cannot use a single variable to fit the characteristics of individual units in the

"Owing to the dependence of transfer function of each stage on the input voltage, it becomes impossible for attackers to utilize a single variable to fit the characteristics of individual units in the circuit. This is despite the fact that these units may be reused multiple times in practice. As a result, the complexity of circuit modeling is significantly heightened."