The theory of complexity shows that although a system may have an optimum state, it is sometimes so hard to identify that the system never settles there.
复杂性理论表明，尽管系统可能存在最优状态，但是有时候我们会发现系统从不处于最优状态。
Mathematical model establishment in nonlinear system such as automobile engine is still very hard. Artificial neural network theory brings to us a new method in nonlinear system identification.
建立汽车发动机这样非线性系统的数学模型非常困难，人工神经网络理论为非线性系统的辨识提供了新的方法。
The theory of weakly hard real-time can describe different real-time system, both hard real-time and soft real-time system are the typical weakly hard real-time systems.
弱硬实时理论能够统一描述原有各类实时系统，硬实时、软实时系统都是一类典型的弱硬实时系统。
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