in a flash

瞬间, 即刻, 非常突然

例句与用法：

I didn't get the number of the car that knocked you over. It was gone in a flash. All I know is that it's a big, brown car.

我没有记下撞倒你的那辆汽车的车号，它一下子就开走了，我只知道那是一辆棕色的大轿车。

The answer came to her in a flash of inspiration.

她突然来了一阵灵感，答案想出来了。

In a flash, the truth came to him.

突然间，他明白了真相。

I'll be back in a flash.

我马上就回来。

详细释义：

瞬间

He'll be back in a flash.

他很快就会回来。