过去“原子是我们的朋友”美好时光也一去不复返了。
The good old days of “Our Friend the Atom” were gone for good.
研究发现，对于什么是对自身最重要的，男性和女性有着广泛的共识，而认为女性地位的上升是以牺牲男性利益为代价的观点也一去不复返了。
The study found that men and women were in broad agreement about what matters most to them; gone is the notion that women's rise comes at men's expense.
少年是一去不复返的，等到精力衰时，努力做学问也来不及了。
Youth will soon be gone never to return. And it will be too late for you to go into scholarship when in your declining years.
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