translation.en: That is, we've gone from four to eight years of education to 12 years of formal education, and 52 percent of Americans have actually experienced some type of tertiary education.
translation.zh: 就是说，我们已经从4至8年的教育 进步到 12 年的正规教育， 52%的美国人 接受了专科以上的高等教育。