According to the geometric character of the plant root systems, application of the L-systems theories in simulating the plant root systems growth was studied.
根据植物根系生长的几何特征，探讨了L系统理论在植物根系生长模拟中的具体应用。
Symbolic dynamical system is a powerful tool in the study of dynamical systems theories, the study of dynamical properties of the general symbolic dynamical system is a far unsolved problem.
符号动力系统是动力系统理论研究的强有力工具，一般符号动力系统的动力学性质的研究是一个远未解决的课题。
The arid landscape required extensive irrigation systems, and principles of shared labor made sense to people who were inspired by the theories of Karl Marx and Robert Owen.
干旱地区需要大量灌溉系统，受卡尔·马克思和罗伯特·欧文的理论鼓舞，接受共同劳动原则的民众能够提供劳动力。
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