由于生物化学工程基于机理十分复杂的生物体系，因而在理论建模、模型求解和优化上必然导致对数学的要求较高。
Because biochemical engineering is based on the biosystem, which has a very complex mechanism, it brings about relative high requirements on modeling, solving and optimizing models theoretically.
混凝土的拉伸破坏机理比较复杂，尚无合适或简便的力学模型和研究方法。
The mechanism of tensile failure of concrete is rather complex, so there are no suitable or convenient mechanics models and research methods.
肿瘤转移是一个相当复杂的过程，建立胰腺癌肝转移模型是研究胰腺癌肝转移机理关键的一步。
Since the tumor metastasis is quite a complex process, the establishment of a liver metastatic model is the key step for the study of the mechanism of pancreatic cancer liver metastasis.
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