adj (1)快(迅)速的(acting or moving quickly;fast)：take (make) a～step/departure 紧走一步/快速离开;a～worker/river工作速度快的工人/湍急的河流;The train was now going at a～rate. 火车此时在快速行驶。The patient's pulse was rather～. 那个病人的脉搏跳得很快。〖同〗quick，fast，swift;〖反〗slow，gradual;

(2)短时间内完成的(performed or occurring during a short interval of time)：～reading快速阅读;an age of～strides in science 科学迅速进步的时代;a～recovery from sb's illness 迅速恢复健康;〖同〗hasty，prompt;〖反〗slow，lazy;

(3)陡的(of a slope)rising or falling sharply;steep);

→′rapidly adv 迅(快)速地;ra′pidity n 快，迅速;陡，险峻;

n 急流险滩(place where the water flows quickly)[通常pl]：run the～s 闯滩;shoot the～s 穿过急流;Further down the river there is another stretch of～s. 沿河顺流而下，还有另一处急流险滩。