rapid
/ˈræpɪd; `ræpɪd/ adj
1
(a) moving or acting with great speed; fast 迅速的; 快的
a rapid pulse, heartbeat 过快的脉搏、 心搏
ask several questions in rapid succession 快速连续提出几个问题
the rapid to-and-fro movements of a piston 活塞快速的往复运动.
(b) happening in a short time; prompt 短时间内发生的; 敏捷的
a rapid decline in sales 销售额的急剧下降
Cats have rapid reflexes. 猫的反应很敏捷.
2 (of a slope) descending steeply （指斜坡）陡的.
3 (idm 习语) make great/rapid strides => stride n.