second
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：
For a few seconds nobody said anything
有几秒钟大家都沉默无语。
She was the second of nine children.
她在9个孩子中排行老二。
My son just got married for the second time
我的儿子刚刚再婚。
Your application must be proposed and seconded by current members.
你的申请必须由现任成员推荐并得到他们的支持。
You play this second half.
这后半场你上。
Her orbital speed must be a few hundred meters per second
其轨道速度一定是在每秒几百米。