Low-frequency active sonar has been proposed as a replacement for traditional high-frequency active sonar, and it can detect the target under water over long ranges using low-frequency active acoustics.是什么意思_Low-frequency active sonar has been proposed as a replacement for traditional high-frequency active sonar, and it can detect the target under water over long ranges using low-frequency active acoustics.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句