instant
单词辨析：
指极短的时间，如转瞬即逝的刹那间，通常用单数。
Please hold on! She will be back in an instant.
请别挂断电话！她马上回来。
The instant I saw him, I knew he was the policeman who had helped me carry the box.
我一看见他便认出他就是那个曾经帮我搬过箱子的警察。
指很短的一段时间，多用于日常口语。
Can you spare a few moments to fill out this questionnaire?
你能抽点时间填写这个问卷调查吗？
He will come back to see you in a moment.
他马上会回来见你的。
指极为短暂的一段时间，常可与 moment 换用。
Don't worry, and he'll be back in a second/moment.
别担心，他一会儿就回来。
Just a second/moment, the reporter will come to interview you.
稍等片刻，那名记者马上会过来采访你。
相关例句：
The show, despite some rough edges, was an instant success.
虽然有一些瑕疵，演出还是一举获得了成功。
No matter what he is offered to eat he polishes it off in an instant
不管给他吃什么，他都能眨眼就下肚。
The news of his death produced an instant outpouring of grief.
他死亡的消息立即引发了强烈的悲痛。
For an instant I was infected by her fear
有那么一会儿她的恐惧也传染给了我。
His eighth book came out earlier this year and was an instant best-seller
他的第8本书在今年早些时候面世，迅速成为了畅销书。
They forgot all their fears and all their miseries in an instant.
他们马上忘记了一切恐惧和痛苦。