运输网络中有流量需求的转运结点不遵从流量守恒条件，也不能按源、汇及中间结点归类。
In transportation networks, a transshipment node with flow demands fails to conform to flow conservation, and can not be categorized to a source, a sink or an intermediate node.
即使初始条件十分光滑，双曲守恒律方程的解也可能出现间断。
The solutions of the Hyperbolic conservation laws might develop discontinuity even if the initial conditions are very smooth.
提出了一种满足通量守恒的内边界耦合条件。
An internal coupling condition is given to make the conservation of flux satisfied.
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