复杂介质中地震波的传播多是通过求取单程或双程波动方程的数值解进行模拟的。
Propagation of seismic wave in complex medium is mostly simulated by numeric solution of oneway or two-way wave equation.
这段长30千米的路程只需8分钟就能完成，单程票价50元，双程为80元。
This 30km ride takes about eight minutes and 50 yuan one way, and 80 yuan for a round trip.
女士：你想要单程的还是双程的？
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