fast,rapid,quick,这组词都有“快的”意思.
fast和rapid虽然有时可以互换使用,但它们有差异,fast强调物体进行相对运动.如a fast horse,a fast train.fast可做副词
The winning car reached a speed of forty miles——much faster than any of its rivals.
获胜的那辆车的时速达到40英里——比它的任何竞争者要快得多.
Letters will cost a little more,but they will certainly travel faster.
寄信要多花一点钱,但无疑书信走得会快一些.
而rapid只表示运动着的物体或事物的本身状况,并不涉及单位时间内所越过的距离.如：rapid work,rapid current,rapid progress
It is a rapid river.
那是一条湍急的河.
Working rapidly in the darkness,he soon changed into the man's clothes.
他在黑暗中动作迅速,很快换上了死者的衣服
quick修饰事情发生得快,占用的时间少,也不涉及速度.如：quick thinking,a quick temper
Roy acted quickly and drove the bus straight at the thieves.
罗伊的动作迅速,开着公共汽车直向小偷扑去.
…the forest authorities ordered several tons of a special type of grass-seed which would grow quickly.
森林管理当局订购了好几顿特殊类型的速生草籽.
…they quickly dragged the drunk to safety.
他们迅速地把醉汉拖到安全处.
