It created lots of top-ranking technologies and inventions: the flight recorder (black box) for aircraft, the retractable seat belt for cars, the heart pacemaker and cardiopulmonary etc.是什么意思_It created lots of top-ranking technologies and inventions: the flight recorder (black box) for aircraft, the retractable seat belt for cars, the heart pacemaker and cardiopulmonary etc.在线翻译_英语_读音_用法_例句