The transport of copper to Beijing was a massive transport project in the Qing Dynasty with a complex and well-developed network.
京铜运输是清代规模宏大的运输工程，其运输道路网络相当复杂与完善。
The groundwater flow and solute transport is very complex because of the intense variability in rock network fracture. How to simulate the water flow and solute transport is a very important question.
由于基岩裂隙网络系统具有强烈的空间变异性，所以其中的地下水流动和溶质运移十分复杂，如何模拟这种系统中的地下水流动和溶质运移一直是一个很重要的问题。
OTN, as the next-generation mainstream transport network technology, faces a more complex network environment. Survivability assurance is essential.
作为下一代传送网主流技术的OTN面临更复杂的网络环境，网络生存性保证至关重要。
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