One with merely a high-school diploma can expect only $1. 3m.

仅获得高中文凭的劳工职业生涯的总预期薪酬为130万。

You've got [American] schools admitting people quite literally to graduate schools who only have a high-school diploma, because they misunderstood what the credential represented.

由于误解资信材料所代表的内容，毫不夸张地讲，美国学校把只有高中文凭的人自然而然地录成研究生。

38 percent of those had a high-school diploma or less.

其中38%的人拥有高中或更低的文凭。