我們可以用短語 as quick as a flash 來形容一個人做事情像閃電般一樣快。
John knew the answer so he put up his hand as quick as a flash.
The customers are complaining. We need to get more food on the shelves as quick as a flash.
另一個含有單詞 flash 的短語 a flash in the pan 的意思是「曇花一現」。
Our football team were champions last year, but that won't happen again. It's just a flash in the pan.