I have no idea what subsonic speed is.
我实在不明白什么是亚声速。
They had flown at a high subsonic speed.
他们以亚音速作高速飞行。
A Numerical Method Study of Longitudinal and Lateral Aerodynamics at Subsonic Speed for Tactical Missiles
战术弹亚声速纵横向非线性气动力计算研究
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