Here is the English translation of your content, keeping all HTML tags intact:,After the wave of humanitarian relief, these young intellectuals returned to the cities, coinciding with a second population peak and resulting in a large number of unemployed youth. These young people, full of vigor but without jobs, spent their days wandering around the cities, engaging in fights and brawls, becoming an extremely unstable factor.,"By the late 1990s, there was a third population boom, and universities then expanded their enrollment... It's still simpler in later generations, with live streaming, food delivery, and ride-hailing apps all coming at once."。