1. fast:

例：

Don't drive so fast - there's ice on the road. (路上有冰，别开太快。）

The new fighter aircraft flies almost twice as fast as the old one. （新的战斗机比旧的那架速度快一倍。）

She walked faster and faster, and then started to run. （她越走越快，然后跑了起来。）

as fast as you can

He ran home as fast as he could. （他尽快跑回家。）

2. quick: use this to tell someone to come or go somewhere quickly

备注：''quick''常用于口语中。

例：

Come quick! your brother's on TV. （快来！你哥哥上电视啦！）

You'll have to walk quicker than that if you want to keep up with me. （想跟上我，还得走快点。）

3. swift: moving fast with a continuous, flowing movement - used especially in literature

备注：''swift''常用于书面语中。

例：

a swift runner（跑得很快的跑者）

She wiped her tears away in one swift movement. （她迅速拭去泪水。）

4. at high speed: moving or working very fast - use this about cars, trains, machines etc.

例：

Two cars raced past him at high speed. （两辆车快速驶过他的身边。）

a disk revolving at high speed（一张高速转动的光盘）

5. at top speed: if a vehicle moves at top speed, it moves as fast as it can go - use this especially when a situation is urgent and someone has to get somewhere very fast

例：

They headed east at top speed in pursuit of the enemy ship. （他们全速向东进发，追寻敌船。）

At top speed, the Pave Hawk helicopter can travel 221 miles per hour. （“铺路鹰”直升机全速飞行时时速可达到221英里。）

6. at breakneck speed: traveling dangerously fast

例：

It took us an hour to get there, driving at breakneck speed. （车开得超快，我们1小时就到了那儿。）

Jenny stepped onto her skis and sped off at breakneck speed down the glistening, white mountain. （珍妮踩着滑雪板，全速冲下白雪皑皑的山峰。）

He drove away at breakneck speed. （他飞快地开（车）走了。）

7. flat out: at the fastest speed possible when using all the strength or power there is

例：

Going flat out, the BMW 325 will reach a speed of 140 miles per hour. （宝马325的最高时速可达140英里。）

The exercise involved running flat out for two minutes and then resting for one minute. （这项训练要求全速跑两分钟，再休息一分钟。）

Everyone is working flat out to finish on time. （为了按时完工，大家都全力工作，尽快干完。）

8. like lightning: moving extremely fast, often with a single sudden movement

例：

Somewhere a dog barked and, like lightning, the cat darted into some bushes. （哪里的狗叫了一声，这只猫像离弦的箭一样蹿进灌木丛中。）

He moved like lightning and caught the little girl before she fell. （眼看那个小女孩就要摔倒，他像闪电一样快速冲过去把她扶住。）

补充：

''like lightning''这个词组里，''lightning''做名词；''lightning''做形容词时，也可以表达类似的意思。

例：

a lightning attack（闪电袭击）

He moved at/with lightning speed and caught the little girl before she fell. （眼看那个小女孩就要摔倒，他像闪电一样快速冲过去把她扶住。）

9. at speed: if a car or train is traveling at speed, it is traveling fast

备注：''at speed''是正式的用法。

例：

The train was already traveling at speed when she tried to open the carriage door. （她想打开车门，此时列车正全速前进。）