Definition: immediately, or very quickly Level: C2
我马上就回来。
I'll be back ___in ___a ___flash.
他拿走了它，然后瞬间浮出水面。
He took it and, ___in ___a ___flash, he came up to the surface.
她瞬间回答了问题。
She answered the question ___in ___a ___flash.
