非常实用的英语口语

in a flash

瞬间，立刻

I'll be there in a flash.

我马上就到

as quick as a flash

像闪电一样快

He ran out of the room as quick as a flash.

他如闪电一般跑出了房间

flash into one's mind

突然闪现

A brilliant idea flashed into her mind, and she wrote it down in a flash.

一个绝妙的点子突然在她的脑海中闪现，她立即写了下来

flash across something

一闪而过

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The barrage flashed across the screen.

弹幕在屏幕中一闪而过

flash back

（电影）闪回，回想

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His mind flashed back to 60 years ago when he was a little boy.

他回想起了60年前, 当他还是个小男孩的时候

当然，

仅仅用flash来形容快还是不够的，

英语里还有很多其它表达“快”的方式

in the blink of an eye

眨眼之间

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My wallet was stolen in the blink of an eye.

我的钱包眨眼之间被偷了

fast and furious

飞快地，充满激情地

They ran fast and furious to win the race.

他们拼了命地跑去赢得比赛

get a move on

赶快= Hurry up

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Get a move on or you'll be late!

快点儿！要不然迟到了！