根据美国国家公路交通安全局的网站，此次召回是由于错误的空气进气道。
According to the NHTSA's Web site, the recall is due to a faulty air intake duct.
对于有超声速空气进气道的导弹，导弹弹身和进气道之间存在着复杂的气动干扰，这种干扰难以从理论上进行精确分析。
For a missile with supersonic inlets, there's complicated aerodynamic interference between body and inlets, and this aerodynamic interference is difficulty to analysis in theory.
进气系统主要包括空气滤清器、进气道、化油器和进气歧管。一些发动机在进气系统中有增压器。
The intake system mainly includes the air filter, intake ducting, the carburetor, and the intake manifold. Some engines have supercharger in the in take system.
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