rapidon.快车rapidadj.短时间发生的；急速的；迅速的；快的；险峻的n.急流；湍滩rapid response快速反应rapid pathways快通道rapid scanning快速扫描rapid traverse快速横动,快速行程rapid freezing速冻rapid-acting速效的rapid turnover快速转换rapid stirring快速搅拌Rapid-growth快速生长Rapidly fading快衰落