The NUS want to make sure that graduate contributions are determined on actual earnings.

全国学生联合会想要确保大学生的还款由学生的实际收入来决定。

Earnings vary based on location; platforms might advertise hourly rates that don't factor in expenses, and large-scale data on actual earnings is sparse.

收入因地点而异；平台可能宣传的小时费率没有把费用算进去，而关于实际收入的大规模数据也很稀少。