n.导航星 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sound navigation and ranging: 声导航及定位; 声呐; 声纳下载手机词典可随时随地查词查翻译