Ⅰ. fast “快”一般指物体的运动速度(speed)快,常用来形容交通工具跑得快,钟表走得快,人的动作快等。如:
① A car goes faster than a truck. 小汽车比卡车跑得快。
② How fast the horse runs! 这匹马跑得多快呀!
Ⅱ. quick 指较短的时间或较近的将来即可发生或完成某事,常用来形容动作敏捷、反应迅速。如:
① Come quick! 快来呀!
② Please give me a quick reply. 请迅速给我答复。
Ⅲ. rapid 表速度之快,往往可与fast通用,但它多指运动本身。如:
① The boy is making rapid progress. 这孩子进步很快。
② Rapid speech is usually indistinct. 急促的语言往往不清晰。
③ The current was rapid. 水流得很急。
Ⅳ. swift 表速度很快而又常指运动平稳而不费力。如:
① Eagles are swift in flight. 鹰飞得很快。
② The curent was very swift. 水流得很快。
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