政府已投资制造这些新型高速飞机.

The government has pumped money into producing these fast new planes.

讨论了影响高速飞机红外作用距离的内外部因素，如飞机的内部传热、探测路径方向与有效辐射面积等。

The physics model of the IR radiation characteristic of high-speed aircraft was established. Ulteriorly, using this result, the …