Simulations about reducing noise excited by engine revolution are done by laying secondary source at proper places on the simplified finite element model of a passenger car.

根据所得结论，在简化的客车有限元模型上的适当位置安放次级声源，对因发动机振动激励引起的噪声进行车内有源消声的仿真分析。

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From the point of passenger source, native land passenger source held great majority.

从客源来看，本土客源占了绝大多数。

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Power says that baggage fees continue to be a major source of passenger dissatisfaction.

FORBES: America's Most Satisfying Airlines

But many states lack a dedicated source of funding for passenger rail.

WSJ: High-Speed-Rail Costs Irk States