rapid /ˈræpid/ I. adj. 快的，迅速：The improvement was rapid. 提高是快的。The train was now going at a rapid rate. 火车正以快速前进。‖II. n. 急流，湍流 ( pl.): descend the rapids of the river 顺激流而下

［辨析］与fast, quick辨见fast

rapidly adv.快地，迅速地