A year later, the rocket exploded just two minutes after liftoff.一年后，韩国火箭在升空两分钟后爆炸。Thousand of spectators gathered to watch the liftoff of the space shuttle.成千上万的观众聚集在一起观看航天飞机发射升空。We have liftoff!我们已起飞升空！The rocket went astray after liftoff.火箭升空后偏离了轨道。