The school has a double standard when it comes to grading, favoring some students over others.
在评分方面，学校存在双重标准，偏袒一些学生而忽视另一些学生。
There is a double standard in the application of rules, where certain students are treated more leniently.
在规则执行上存在双重标准，某些学生受到更宽容的对待。