On account of the high non linearity related to the large amplitude motion of free liquid surface, it is very difficult to obtain a complete theoretical solution.
它涉及到自由液面大幅度运动的一系列非线性问题，很难获得一个完全的理论解。
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。
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