This system can be used to calculate the aircraft take-off, approach and side-line noise( EPNL) for the purpose of aircraft noise certification, and to calculate the sound pressure and spectrum at airframe surface in cruise flying.是什么意思_This system can be used to calculate the aircraft take-off, approach and side-line noise( EPNL) for the purpose of aircraft noise certification, and to calculate the sound pressure and spectrum at airframe surface in cruise flying.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句