汉译英，好就给分

Being a complex non linear system:, it is an important component .

http://sh.dict.cn/search/?q=non+linear+system&r=%B7%C7%CF%DF%D0%D4%CF%B5%CD%B3

as a complicated nonlinear system,it's a very important part of it.

As for this complicated nonlinear system, it is one of the most important parts.

不能用As a complicated.....,因为 主语It并不是"非线性系统".

As a complicated non-linear system, it is one of the important parts.

As a complex nonlinear system, he is the important constituent