a rocket designed to explode high in the air as a signal or firework
（作为信号或焰火的）冲天火箭。
(-rocketed, -rocketing)no obj.
informal (of a price, rate, or amount) increase very steeply or rapidly
〈非正式〉（价格、比率或数量）急速增长, 猛长：
the cost of the welfare system has skyrocketed.
福利系统费用急速增长。