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.
风洞试验是进行汽车空气动力学研究的重要手段。
Wind tunnel testing is an important means for the study of automotive aerodynamics.
汽车风洞是进行汽车空气动力学研究的主要试验设备。
And automotive wind tunnel is a main test equipment to research automotive aerodynamics.
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