It is worth mentioning that classes of service add a third dimension to what was a two-dimensionalnetwork.
值得提及的是，分类服务向二维网络增添了第三个维度。
2
A real time modeling approach for nonlinear discrete time system is presented by using the concept of time variant recurrent neural network and the theory of twodimensional system.
利用时变反馈神经网络的概念及二维线性系统理论给出了非线性离散系统的一种实时建模方法。
3
Then, the paper essentializes the two key problems in the course of building a three-dimensional monitor network: the optimum geometrical graph and the precision distance surveying.