由于非线性体系不能采用叠加原理，参数较多，所建立的非线性反应谱比较繁琐。
Because superposition principle is not applicable for inelastic system with more parameters, the inelastic response spectrum is more complex.
研究表明，噪声在非线性体系形成时空有序结构的过程中能起到非常重要的积极作用。
We found that the noise can play an important role in the formation of the order spatiotemporal construction in nonlinear systems.
中医证候体系是一个非线性的复杂巨系统。
TCM Syndrome is a non-linear system of complex giant system.
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