The cruelty of this sentence is that from his observation and summary, most of the students who can be admitted to Tsinghua and Peking University are "gifted and excellent in genes"; What's more cruel is that those students who can't pass the exam by studying but can enter Tsinghua Peking University by other skills can only be said to have won the ovarian lottery.

Because of his work, he has been to many students' homes in Tsinghua Peking University.

These people's families are rich and expensive, but also poor. Of course, most of them are working-class or middle class. In either case, when parents talk about their children, they always say, "He has been studying well since childhood, and we seldom worry about it." .

He has been to a family where both parents collect waste products, but his child was admitted to a middle school in the city from a remote small county, and from then on, he was admitted to Tsinghua.

His family conditions are so bad, his parents are uneducated, but his grades are good.