[航 水运] 导航卫星导航系统 real-time navigation system: 实时导航系统navigation satellite timing and ranging: 导航卫星定时和测距pulse ranging navigation: 脉冲测距导航sonar (sound navigation and ranging): 声呐,水声测位仪sonar(sound navigation ranging): 声纳下载手机词典可随时随地查词查翻译