Due to the complexity and high non-linearity of microbial fermentation process, it is difficult to model the process of fermentation precisely.
由于微生物发酵过程机理的复杂性和高度非线性，建立发酵过程的精确模型具有一定难度。
Due to the complexity and high non-linearity of microbial fermentation process, most simple mathematical models cannot describe the behavior of biochemistry systems very well.
由于微生物发酵过程的复杂性和高度非线性，更多的简单的数学模型不能很好地描述这类生化系统。
The penicillin fermentation process is a very complicated biochemical process accompanied with secondary microbial metabolism, which is affected by many factors.
青霉素发酵过程是一个具有二次微生物代谢的生化过程，机理复杂，影响因素繁多。
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