fast
单词辨析：
指移动速度快的或能够快速移动的，也可指迅速或立即发生的。
a fast rate of increase
很快的增长率
She took a fast train to Shanghai.
她搭乘快车前往上海。
His motorboat is very fast.
他的汽艇速度非常快。
指持续或耗费时间短的，移动、做事等速度快的，或指人聪明、机敏的。
She gave the teacher a quick answer.
她给了老师一个迅速的回答。
He walked with quick steps.
他急速走着。
He is a quick boy.
他是一个机灵的男孩子。
The employee is a quick learner.
那名员工学东西很快。
指快速发生或完成的。
a rapid recovery
迅速康复
The company made a rapid profit growth in the last decade.
这家公司在过去10年间利润快速增长。
指立即发生或马上做出的；也可指移动速度快的或能够快速移动的，作此义解时只作定语。
a swift runner
跑得快的人
They gave a swift reply.
他们立刻给出了答复。
Hearing footsteps, the two thieves made a swift exit.
听到脚步声，那两名小偷飞快地溜走了。
相关例句：
Brindley was known as a very, very fast driver
众所周知，布林德利是个喜欢飞车的人。
He told supporters to stand fast over the next few vital days.
他叫支持者在接下来的几个重要日子里站稳立场。
We'd appreciate your leaving as fast as possible.
如果您能尽快离开，我们将不胜感激。
We can only try to hold fast to the age-old values of honesty, decency and concern for others
我们只能努力坚守那些古老的价值观：诚实、正派、关心他人。
I threw caution to the wind and rode as fast as I could.
我不顾一切，骑得飞快。
She climbed the staircase cautiously, holding fast to the rail
她紧紧地抓着栏杆，小心翼翼地爬楼梯。