help me change this paragraph to english 具体而言在设计中为了使电路单元具有较高的非线性特性不同工作区域的特性被耦合通过low threshold voltage transistor M2 被采用为了使其工作在饱和区while high threshold voltage transistor M3工作在亚阈值区。

Specifically, in the design, to make the circuit unit have higher non-linear characteristics, the characteristics of different operating regions are coupled through the use of low threshold voltage transistor M2 to make it operate in the saturation region, while high threshold voltage transistor M3 operates in the sub-threshold region.