generation gap

基本解釋

Both parents and teenagers must try to bridge the generation gap between them.
父母和青少年雙方必須盡力彌合代溝。
We often hear about the “generation gap” that occurs between parents and children when it comes to music, morals, fashion and a host of other things.
我們總能聽到父母和孩子之間存在“代溝”，音樂、道德準則、時尚以及很多事情上雙方看法都不同。
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But this divide—what William Frey of the Brookings Institution in Washington, DC, calls “the cultural generation gap”—is very much wider in some states and cities.
美國華盛頓布魯克林研究所的威廉?弗雷稱此種文化代溝在某些州和城市的分化影響更大。

The generation gap in our country is so huge that it's hard to make a compromise."

One of her customers was a 34-year-old IT guy, so maybe they bridged a generation gap.
FORBES: New Company Rents Your Car By The Hour
Interestingly, the revenue generation gap between iPad and iPhone has been narrowing as well.
FORBES: Android Apps Closing The Revenue Gap With iOS Apps Rapidly
And there is a yawning generation gap: 55% of 18-29-year-olds support gay marriage, but only 21% of those over 65.
ECONOMIST: Gay marriage

If you refer to the generation gap, you are referring to a difference in attitude and behaviour between older people and younger people, which may cause them to argue or may prevent them from understanding each other fully.