very quickly; at a great rate to increase/spread/expand rapidly 快速增加/扩展/扩展 to change/develop/evolve rapidly 迅速改变/发展/发展 a rapidly growing economy 迅速增长的经济 Crime figures are rising rapidly. 犯罪数字正在迅速上升。 It rapidly became apparent that there were insufficient officers to maintain control. 很明显,没有足够的官员来维持控制。 The technology is rapidly changing. 技术日新月异。