a situation in which students are given higher grades (= scores on tests) than in the past, so that the general level of grades among students increases

He said that primary schools and high schools are just as guilty of grade inflation. 他说，小学和中学也同样存在成绩通胀的问题。

To guard against grade inflation, the number of top grades in each class is limited. 为了防止成绩通胀，每个班级获得最高档次成绩的人数是有限的。