Alarm indication signal (AIS) should be progressive response, light first and then sonance follows, the time interval should be 15 secs.是什么意思_Alarm indication signal (AIS) should be progressive response, light first and then sonance follows, the time interval should be 15 secs.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句