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. 他悔燃在黑暗中动作迅速，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. 罗碧激虚伊的动作迅速，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铅册到安全处。
