The 5G networks are digital cellular networks, which is aimed at achieving high data rate, reduced latency, energy saving and re

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• For shorter distances many cities have networks of （）, also known as suburban trains, serving the city and its suburbs.
• China’s HSR accounts for 15 of the world’s total high-speed railway networks.
• （）突出了经济运行的基本组织形式，即网络化特征（Networks）。