一去不复返

Don't use time or words carelessly. Neither can be retrieved.

注意时间和语言的使用，两者都是一去不复返的。

Who said that the age of chivalry was dead?

谁说骑士风尚的时代已一去不复返了？

At the root of the research is the circadian rhythm, the body's natural sleep and walking cycle.

面对着城门的是人民英雄纪念碑。中国依赖外国石油的日子一去不复返了。

But, you are cleaver, pls tell me that why the date didn't return back.

但是，聪明的，你告诉我，我们的日子为什么一去不复返呢？

But, cleverness of, you tell me, past day why a don't reply to return?

但是，聪明的，你告诉我，过去的日子为什么一去不复返呢？

Dawn on/upon# become gradually known to 逐渐明白 It suddenly dawned on her that her youth was gone.

她突然意识到，自己的青春时光已经一去不复返了。

In that case, everything you have ever worked for is gone forever, and you are now destitute.

在这种情况下，一切你都工作了，已经一去不复返了，你现在一无所有。

It was under his government, he claimed, that the "detritus of the past" was all swept away.

他称在他的政府下，"碎石的过去"一去不复返。

Those days when Chinese were in a state of disunity have gone forever.

中国人一盘散沙的日子已一去不复返了。

The days of national disunity and chaos which the people detested are gone, never to return

人民所厌恶的国家分裂和混乱的局面，已经一去不复返了。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐