高速铁路隧道设计参数主要是由高速列车进入隧道所诱发的空气动力学效应确定的。

The determination of design parameters for tunnels on high speed railway is mainly affected by aerodynamic events arising from the running of high speed train in tunnels.

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因而，对于隧道空气动力学效应的作用机制和其减缓措施进行深入研究是非常必要的。

Therefore, lucubration of tunnel aerodynamic effect's mechanism and corresponding alleviation measure is very necessary.

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地面效应是汽车空气动力学研究的主要难点之一。

The ground effect is one of the main difficulties in road vehicle aerodynamics.

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