Definition
Used to describe something that happens extremely quickly or almost instantaneously.
转瞬间，一眨眼
Before you could say Jack Robinson, she had already uploaded the files.
你还没来得及说杰克·罗宾逊，她就已经上传了文件。
Before you could say Jack Robinson, he had devoured the whole pizza.
你还没来得及说杰克·罗宾逊，他就已经把整个披萨吃光了。
Before you could say Jack Robinson, the playing cards had vanished as the magician started his performance.
你还没来得及说杰克·罗宾逊，魔术师一开始表演，扑克牌就消失了。