"瞬间一刻" 的英文表达是 "a moment's notice"。这个表达来自英语中的一个成语,意思是在短时间内做出反应,也就是 "at a moment's notice"。

例句:

The team is always ready to respond at a moment's notice. (这个团队总是随时准备应对。)
Can you be packed and ready to leave at a moment's notice? (你能在瞬间准备离开吗?)
She was able to make a decision at a moment's notice. (她能在瞬间做出决定。)