rapid

名词 rapid:

1. a part of a river where the current is very fast

形容词 rapid:

1. done or occurring in a brief period of time
2. characterized by speed; moving with or capable of moving with high speed
   同义词：speedy

1. With the rapid economical development, China's position on the international stage is getting more and more important.
   随着经济迅速发展，中国在国际舞台上的地位变得愈来愈重要了。
2. The student is showing rapid progress in his studies.
   这个学生学习上进步很快。
3. The rapid spread of the disease is alarming the medical authorities.
   这种疾病的迅速蔓延使医疗当局感到忧虑不安。
4. The intercession has made a rapid progress.
   调解已经取得了很大的进展。
5. A tremulous or pulsating effect produced in an instrumental or vocal tone by barely perceptible minute and rapid variations in pitch.
   颤音一种颤动或振动效果，由可察觉的微小迅速的音阶变化在声音或乐器的调子中产生的
6. Loud or rapid talk; chatter.
   聊天大声急促的谈话; 聊天
7. Childhood is a period of rapid growth.
   幼年是生长迅速的时期。
8. He made rapid progress in his studies.
   他学习上进步很快。

rap.id

adj.（形容词）
rap.id.er,rap.id.est
Moving, acting, or occurring with great speed; swift.See Synonyms at fast
迅速的：以极高速度运动，行动或发生的；飞快的参见 fast
n.（名词）
An extremely fast-moving part of a river, caused by a steep descent in the riverbed. Often used in the plural.
急流，湍滩：由于河床倾斜下降而形成的流动极快的河流的一部分，常用复数

来源：
Latin rapidus
拉丁语 rapidus
from rapere [to seize] * see rep-
源自 rapere [抓住] *参见 rep-

【引伸】
rapid.ity
rap.idly
adv.（副词）