从未的英文：
at no period
never a
not for a moment

参考例句：

I’ve never eaten kiwi fruit. What does it taste like?
我从未吃过猕猴桃，它什么味道？

Such a miracle has never occurred before.
这种奇事过去从未发生过。

Thomas never lost his feeling for Harriet.
托马斯对哈丽雅特的爱从未消逝。

His horses speed lightly, and never a drop touches the brazen axle."
神马脚步轻快，黄铜车轴从未打湿过。”

The most unfortunate people in the world are those who have never discovered how satisfying it is to read good books.
世上最不幸的人就是那些从未体会过阅读坐作所带来快乐的人。

In this last remark Bernoulli ascribes knowledge to Taylor that Taylor never displayed
在最后一段话里Bernoulli把Taylor从未展示过的知识归到Taylor身上。

President George W. Bush, who was spending Halloween at his Texas ranch, has never reported seeing a ghost, Walters said
沃尔特说，布什总统的万圣节是在德克萨斯的农场度过的，他从未听布什总统说起过撞到鬼。

Considering the influence of nonverbal communication, we never really stop communicating
想到非语言沟通的影响范围，我们其实从未真的停止沟通过。

They never neglect their duties.
他们从未玩忽职守。

She never asked for pity before.
她过去从未乞求怜悯。

period是什么意思：
n. 时间；时期；周期；经期；课时；局；句号
adj. 某一时期的；当时特有的

juvenile period
幼年期(构成中心木质部的一段时期)

But this is a transitional period.
但这是个转变过程。

The period includes the legal period and the period designated by the people's court.
期间包括法定期间和人民法院指定的期间。

never是什么意思：
adv. 从不，不曾；决不

to dream of a never - never land where everyone is rich
梦想中的理想之国，那里人人富有

Never be haughty to the humble. Never be humble to the haughty.
对谦卑的人切勿傲慢，对傲慢的人切勿谦卑。

China will never seek hegemony and never go in for expansion
中国永远不称霸，永远不搞扩张。

moment是什么意思：
n. 片刻，瞬间；时机；重要；力矩，矩

at this exigent moment
在此危急关头

On the spur of the moment
一时冲动

stalling moment
失速力矩|使气流离体力矩